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Patient and caregiver experiences of living with acute hepatic porphyria in the UK: a mixed-methods study



This study used quantitative and qualitative research methods to analyze how acute hepatic porphyria (AHP) affects patients with varying annualized porphyria attack rates. The overall impact of AHP on patients and caregivers, including their quality of life, was explored. The nature and treatment of acute attacks, experiences of long-term heme arginate treatment and access to other appropriate treatment, and the extent of and treatment for chronic symptoms were also investigated within this study.


Patient and caregiver data were collected via an online survey of members of the British Porphyria Association, followed by an optional 1-h telephone interview.


Thirty-eight patients and 10 caregivers responded to the survey. Of those, 10 patients and three caregivers completed follow-up interviews. Overall, 19 patients (50%) had experienced an acute attack within the previous 2 years, and the severity and types of symptoms experienced during or between acute attacks varied considerably. There were no clear definitions among patients for ‘mild’ or ‘severe’ attacks. Treatments and treatment settings used to manage attacks also varied. Following unsatisfactory care experiences at hospitals, some patients reported avoiding further hospital services for later attacks. Therefore, using settings of care as a measure of attack severity should be avoided. Ninety-four percent of patients also experienced chronic symptoms, which were as varied as acute attacks. Pain was the predominant chronic symptom and was managed with opioids in severe cases. Regardless of AAR, porphyria heavily impacted the daily lives of patients and caregivers. Although patients experiencing frequent attacks generally endured a greater impact on their daily life, patients with less frequent attacks also experienced impacts on all domains (social, leisure activities, relationship with family, relationships, psychological wellbeing, finances, employment, and study). Caregivers were most affected in the finance, relationships with family, and employment domains, and just over half of the caregivers reported a moderate impact on their psychological wellbeing.


The burden of illness with AHP is high across all patients, regardless of frequency of attacks, and AHP negatively affects patients and caregivers alike.


Porphyrias are a group of largely hereditary metabolic disorders caused by a defect in heme biosynthesis and are classified according to the principal site of expression, as either hepatic or erythropoietic [1]. Acute hepatic porphyria (AHP) is characterized by acute attacks of pain (usually abdominal), autonomic symptoms (e.g., hypertension, tachycardia, nausea, vomiting), and neurologic manifestations such as weakness, confusion, and seizures [2, 3]. AHP attacks are potentially life-threatening, and some patients also develop chronic, debilitating symptoms that negatively impact daily functioning and quality of life [3].

The prevalence of symptomatic AHP in the UK is estimated to be 1 in 100,000 [4]. However, lack of clinical recognition of AHP and the use of inappropriate diagnostic tests may result in underdiagnosis and underestimation of prevalence calculations [5, 6]. Of the four types of AHP, acute intermittent porphyria (AIP) is the most common and most associated with frequent acute attacks. Variegate porphyria (VP) and hereditary coproporphyria (HCP) present with cutaneous manifestations alongside the acute neurologic manifestations [7]. The fourth type, aminolevulinic acid dehydratase deficiency porphyria (ADP), is autosomal recessive, with only a handful of case reports in the literature [7].

The results presented here are based on the AHP treatment options available to the surveyed patients at the time of the study, at which time there were no approved treatments for the prevention of AHP attacks. Management of AHP was limited to environmental and symptom management, including avoidance of factors that trigger an attack, treatment of the acute attacks, management of pain and chronic symptoms, and protecting skin from the light in cutaneous manifestations (VP and HCP) [5, 8]. Treatment decisions were largely influenced by patient severity, most commonly defined by frequency and severity of attacks [9, 10]. As a result, previous studies have stratified patients by frequency of attacks, known as the annualized attack rate (AAR) and defined as annualizing the number of AHP attacks over a specified time period. For instance, patients may be stratified as those with an AAR of either ≥ 3 or > 4 attacks per year (‘recurrent attacks’) and those with fewer or no attacks [11,12,13]. Those with recurrent attacks represent approximately 3–5% of the overall patient population [9].

Several studies have characterized the disease and disease burden of patients with AHP [2, 3, 7, 11,12,13,14], with a focus on patients experiencing recurrent attacks [3, 11, 12]. Disease characteristics in patients having fewer attacks are less well understood [13]. This study used both quantitative and qualitative research methods to build on the existing research to analyze the effects of AHP on patients with different frequencies of AAR. The nature of acute attacks, chronic symptoms, and subsequent impacts of the burden of the condition on the patients’ and caregivers’ quality of life, physical functioning, work, social and family life, personal relationships, and perceptions of the healthcare system were considered as part of the analysis.


A total of 38 patients and 10 caregivers responded to the survey. Of those, 10 patients and three caregivers completed the follow-up interviews. Figure 1 provides a full overview of the patient and caregiver samples. Most participants (both patients and caregivers) in the online survey and subsequent interviews were female (90% and 69%, respectively). Participants had or were caring for someone with AIP, VP, or HCP (survey: 77%, 21%, 2% and interviews: 92%, 8%, 0%, respectively). All interviewed patients had experienced at least one attack in the past 2 years that required hospitalization, an urgent healthcare visit, or treatment with intravenous heme arginate at home. Across 28 patients in the survey population, a mean of five attacks per patient was reported over the previous 2 years. Full patient and caregiver demographics and clinical characteristics for the online survey and follow-up interviews can be found in Tables 1 and 2, respectively. Where the interviews included patient and caregiver descriptions of the impact of porphyria, a breakdown of the frequency of the patients’ attacks is shown in Additional file 1: Table S1.

  1. 1.

    Acute porphyria attacks

Key findings The severity and types of symptoms during or between acute attacks varied considerably. Among patients, there was no clear definition reported for ‘mild’ or ‘severe’ acute attacks; definitions varied per patient and were dependent on individual disease experiences.

Fig. 1
figure 1

aWhere not all mandatory questions were completed. bWhere the survey was closed at one of the survey eligibility questions. cWhere patients/caregivers did not meet the eligibility criteria

Patient and caregiver flow diagram.

Table 1 Demographics and characteristics from the online survey
Table 2 Demographics and characteristics from the telephone interviews

Among the online-survey group (n = 38), 84% (n = 32) reported experiencing an acute attack since being diagnosed with AHP, 5% (n = 2) reported never experiencing an attack, and 11% (n = 4) were unsure if they had ever experienced an acute attack. Of those patients who had experienced an attack since diagnosis, 81% (n = 26) reported experiencing an attack within the past 2 years.

In the interviews, patients were asked to further define the characteristics of an ‘acute attack’ by describing the symptoms they tended to experience. Table 3 summarizes these symptoms. Specifically, the symptom of intense pain during attacks was experienced and detailed by patients suffering from varying frequencies of annualized porphyria attack rates (AARs) (Table 4).

Table 3 Summary of patient-reported description of attack symptoms during the interviews
Table 4 Quotes relating to acute pain as an experienced symptom

Questions relating to the severity of acute attacks were not included in the survey. In the interviews, patients stated that the severity of acute attacks can vary, and it became clear that there is no consensus definition for what constitutes a ‘mild’ or ‘severe’ attack. Rather, the severity of attack was based on patients’ unique, subjective disease experience. One consideration of the severity of an acute attack identified through the interviews was based on whether the acute attack could be managed at home or if hospital admission was required (caregiver, n = 1; patient, n = 5) (Table 5). Others considered attack severity by the type of symptoms they experienced (patients, n = 4) or the duration of the attack (patient, n = 1) (Table 5).

  1. 2.

    Treatment of attacks

Key findings Treatment to manage attacks varies, and previous hospital experiences can affect whether the patient chooses to return to hospital or tries to manage attacks at home. There is considerable variability in satisfaction with access to treatment. Patients expressed gratitude at being able to receive treatment with heme arginate; however, long-term heme arginate was not without practical and physical impact.

Table 5 Quotes relating to defining the severity of acute attacks

The majority of patients in the survey (84%, n = 27/32) were able to specify the treatments required to manage their acute attacks (Fig. 2a), and of these, 71% of patients (n = 23) were able to specify the setting in which their acute attacks were treated (Fig. 2b). The majority of these attacks (60%, n = 87) were managed at home.

Fig. 2
figure 2

aPatients were able to select more than one setting in which their attack was managed. bTwenty-three patients responded to this question, reporting a total of 146 attacks. cThe survey did not differentiate between symptomatic treatment or prescribed treatment at home with heme arginate

Management of acute attacks. a Treatment to manage acute attacks; b setting in which acute attacks were manageda,b,c.

The interviews provided examples of when patients felt their acute attacks could no longer be managed at home, including when the patient could no longer eat or increase their carbohydrate intake any further (caregiver, n = 1; patient, n = 3), or when the pain could no longer be managed at home (caregiver, n = 1; patient, n = 1) (Table 6). Three patients and one caregiver noted that while opioid medication was available at home, it was not considered effective for managing the pain associated with a severe attack.

Table 6 Quotes relating to management of acute attacks

Figure 3 displays the results of the patients (n = 27) from the survey who reported their satisfaction in relation to how their acute attacks were managed by treatment over the past 2 years. Combined values of patients who were ‘dissatisfied’ and ‘very dissatisfied’ with the effectiveness of treatment for their acute attacks (43%) were broadly similar to the combined values of patients who were ‘satisfied’ or ‘very satisfied’ (42%). Two patients and one caregiver stated dissatisfaction in treatment management was due to a lack of understanding and recognition of AHP in Accident & Emergency (A&E), which resulted in delays to appropriate treatment (Table 7).

Fig. 3
figure 3

Patient-reported satisfaction with the management of their acute attacks within the past 2 years (n = 27)

Table 7 Quotes relating to the challenges in accessing appropriate treatment

Limited questions relating to prophylactic heme arginate use were included within the survey. However, four of the 10 patients included within the interview phase received prophylactic heme arginate treatment (all had ≥ 3 attacks per year); three patients received it every other week, and one patient had a weekly regimen. Treatment infusions were administered at home (n = 3) through either self-administration, nurse administration, or caregiver administration. The fourth patient was required to go to hospital for their infusion due to difficulties in accessing the central venous line at home. The patients described the difficulties associated with repetitive heme arginate use, including drug administration and iron accumulation, in Table 8.

  1. 3.

    Chronic symptoms

Key findings Chronic symptoms were common in most patients, regardless of AAR, and were as varied as acute attacks. The use of analgesics was the most frequently reported method to manage chronic pain associated with AHP. Patients reported a lack of treatment options to manage their other symptoms, including fatigue, tiredness, lack of concentration, and confusion.

Table 8 Quotes relating to the challenges of long-term prophylactic heme arginate (off-label) treatment

The survey reported that 94% (n = 30/32) of patients experienced chronic symptoms between acute attacks. The most common were pain (81%, n = 26), fatigue/tiredness (78%, n = 25), emotional distress (75%, n = 24) and trouble sleeping (56%, n = 18). The range of chronic symptoms experienced by patients with AHP were further elucidated in the interviews. Chronic physical symptoms included paralysis, muscle weakness, pain, psychological depression, and difficulty concentrating (Table 9).

Table 9 Quotes relating to the types of chronic symptoms experienced

In addition, some participants alluded to a phase separate to or overlapping with the acute attack and chronic symptom phases. Symptoms often did not fully resolve during the patient-labeled ‘recovery process’, with 60% of patients experiencing some form of permanent neurologic damage, even those with AHP who had < 3 attacks per year (Table 9).

Questions relating to the management of chronic AHP symptoms were not included within the survey due to the innate complexity and variability of disease management. The patient and caregiver interviews demonstrated how pain was the predominant chronic symptom experienced, the management of which often involved regular analgesics—including codeine and stronger opioids in more severe cases (Table 10). Furthermore, adequate pain relief was not achievable for every patient due to challenges with treatment tolerability.

  1. 4.

    Impact of AHP

Key finding Regardless of AAR, AHP heavily impacts the daily life of patients and caregivers. While patients experiencing more frequent attacks generally endured a greater impact on their daily life, patients experiencing less frequent attacks also experienced impacts on all domains.

Table 10 Quotes relating to the treatment of chronic symptoms

A total of 30 patients completed the survey question relating to the overall impact on their life. Patients were asked about the extent to which AHP affects aspects of their life on a 5-point scale, ranging from ‘no impact at all = 0’ to ‘extremely = 4’. Mean impact scores were calculated for each domain. Mean results were slightly higher in patients with ≥ 3 attacks per year across most domains, although patients who had < 3 attacks per year clearly experienced an overall impact on various aspects of their life, most notably in ‘employment’, ‘study’, ‘social life’, ‘psychological wellbeing’, and ‘leisure activities’ (Fig. 4).

Fig. 4
figure 4

aMean impact scores based on patient responses were calculated as follows: ‘no impact at all’ = 0, ‘slightly impacted’ = 1, ‘moderately impacted’ = 2, ‘severely impacted’ = 3, and ‘extremely impacted’ = 4. ‘Not applicable’ responses were not included

Mean impact scoresa by domain in patients with AHP (n = 30).

During the interviews, all patients (n = 10) explained how their acute attacks or chronic symptoms affected their work. For acute attacks, this related to whether they had long or frequent hospitalizations or sick leave (Table 11). For chronic symptoms, this included long-term changes in their working ability: for example, needing to move from full-time to part-time, self-employed, or freelance employment (patients, n = 2; caregiver, n = 1) or to voluntary work or unemployment (patients, n = 4); changes in their job role (patients, n = 4; caregiver, n = 1); or a reduction in the hours able to work (patient, n = 1) (Table 11). For some participants, working in shifts and having a demanding job was no longer feasible, while for another, it affected their ability to study.

Table 11 Quotes relating to the impact of AHP

Financial strain was reported (patients, n = 5; caregiver, n = 1) as a result of the impact of AHP on the patients’ or caregivers’ ability to work (Table 11). One patient noted the impact of not working on their social esteem and feeling part of society (Table 11).

Social and family life for patients and caregivers was dependent on reducing or changing the habits that existed prior to their AHP diagnosis. Seven patients and two caregivers shared experiences of how they felt their relationship with their partner had changed due to AHP. These changes included their roles as husband or wife and the levels of intimacy within the relationship (Table 11). Another patient, who was single at the time of the interviews, spoke of the difficulties in engaging in any new relationships due to their illness. Impacts on psychological wellbeing, including feeling anxious or depressed, were reported within the survey (18%, n = 7). The interviews supported this finding and elaborated further on psychological symptoms of anxiety and depression (Table 11).

The majority of patients reported difficulty in carrying out household tasks such as cooking, shopping, and cleaning (90%, n = 9). Mobility (40%, n = 4); in personal care such as washing and showering (30%, n = 3); and maintaining independence (30%, n = 3) were also noted as challenges. The subsequent interviews reinforced that personal independence, the need for care and assistance in carrying out household tasks, and assistance with mobility were dependent on the caregiver and other unpaid support from family (Table 11).

The survey captured the average amount of time caregivers spent per week caring for their loved one with AHP (Fig. 5a). Caregivers were also asked to rate how much caring for someone with AHP impacted various aspects of their life, from ‘not at all’ to ‘extremely’. Most caregivers reported financial impact, relationships with spouse, and employment as the most severely impacted domains, while just over half of the caregivers reported a moderate impact on their psychological wellbeing (Fig. 5b). The impact of AHP on caregivers was also captured in the interviews (Table 11).

Fig. 5
figure 5

aMean impact scores based on patient responses were calculated as follows: ‘no impact at all’ = 0, ‘slightly impacted’ = 1, ‘moderately impacted’ = 2, ‘severely impacted’ = 3, and ‘extremely impacted’ = 4. ‘Not applicable’ responses were not included

Analysis of caregiver responses. a Mean number of hours per week caring for their loved one; b Mean impact scoresa by domain in caregivers caring for patients with AHP.


The objective of this study was to explore the burden of illness of AHP, including the extent to which AHP affects work and finances, social and family life, personal care, independence, and relationships, from both patient and caregiver perspectives. This study included those patients with an AAR of < 3 attacks per year, as well as those with ‘recurrent attacks’ of ≥ 3 per year.

The results of the survey demonstrated that the majority of patients had experienced an acute attack, with a minority of patients never having experienced an acute attack. Of note, 11% (n = 4) of patients were unsure if they had ever experienced an attack, highlighting the varied and complex nature of attacks. These patients may have experienced an attack that they perceived to be too ‘mild’ to be considered, or they may have been unsure because of there being no universal definition of an ‘attack’ within AHP. Interestingly, while studies often define severity by the number of attacks, patients and caregivers did not specify that number of attacks was a driver of severity. This may be because they focus on one acute attack at a time, as opposed to a holistic awareness of the number of attacks they have experienced in a year. As seen in Fig. 2, the majority of patients surveyed (60%) also reported that they were able to manage their attacks at home. Attack severity is often attributed to the setting in which the attack is treated; our finding therefore challenges the assumption that if a patient is not presenting in the hospital, they must not be experiencing a severe attack.

The survey reported that 94% of patients experienced chronic symptoms between acute attacks. This supports the research carried out by Gouya et al. [12], which found that most patients experience chronic symptoms as well as acute attacks and that chronic symptoms can also adversely impact daily living and quality of life. This study identified a potential intermediary phase between an acute attack and the experience of chronic symptoms: a ‘recovery phase’ where patients perceive the worst of their attack to be over, while still suffering from the ramifications of the attack (for example, paralysis or muscle weakness). The ‘recovery phase’ can often be so prolonged that patients may progress into a new attack before they have fully recovered. Further research is required to fully understand this phase and the potential cumulative effects on the patient.

Pain was the most frequently reported acute and chronic symptom for AHP patients. Management of pain as a chronic symptom was a key theme throughout the survey and interview responses. While most patients tried to manage their acute attacks at home, difficulty in pain management following an increase in the severity of pain was a key driver for seeking hospital care. Despite this, there was still an overall reluctance to seek medical care as a result of the difficulties patients and caregivers experienced within the hospital setting. As seen in Fig. 3, these difficulties related to a lack of understanding and recognition of AHP among healthcare professionals, leading patients and caregivers to withdraw from the healthcare system and creating a barrier to them seeking treatment. It is therefore important to understand that attack severity and definition may not be best determined by the setting.

The burden of AHP on patients’ and caregivers’ social, family, and working lives is substantial. For both patients and their caregivers, employment, finances, and psychological wellbeing are the aspects of life that were most severely affected by AHP. In this study, disease impact was observed by most patients, regardless of the number of attacks being experienced. However, disease impact did appear to increase for most aspects of quality of life as attack frequency increased, shown in Fig. 4. These are significant findings as most previous studies have only established reduced quality of life in patients experiencing recurrent attacks, with little data being captured for patients experiencing infrequent attacks. Given that AHP typically presents in people between 20 and 45 years old, the lifelong physical, emotional, and economic burden to patients and their families is high, and the subsequent implications for the healthcare system are likely considerable. While a patient’s experience with their disease may ebb and flow, they are nevertheless often left with long-lasting physical, mental, and emotional consequences. There is a clear need to improve education on AHP within the wider healthcare system (e.g., first points of contact for patients), to ensure there is an urgency to treat, to improve patient care, and to prevent further attacks and disease progression.

All patients included in the interviews had experienced at least one attack in the past 2 years, indicating that despite current disease management efforts, attacks could not be fully prevented. It is therefore important to have efficacious and tolerable treatment options available. Where possible, treatment decisions should aim to anticipate cumulative negative effects and minimize social and personal restrictions and the impact of time off work. The availability of additional treatment options for AHP may have a considerable impact on patients, caregivers, and the healthcare system [15].

Study strengths and limitations

Purposive sampling enabled a lower margin for error and enabled the researchers to target a difficult-to-reach demographic. The majority of participants were females in their 2nd to 4th decades of life at time of diagnosis; while this reflects the gender and age incidence observed for AHP [2, 7], the paucity of experiences from male patients and patients of younger or older ages with AHP is a limitation within this study. Although the number of in-depth interviews conducted was small, results were consistent with those observed in the larger survey, suggesting that the results may be generalized to the population of patients with AHP in the UK. Patients and caregivers also noted that they found the experience cathartic.

Although the patients’ healthcare providers were not required to confirm their diagnosis, patients were asked to select answers reflecting that they had a confirmed diagnosis. These questions included asking what type of porphyria they had and the type of diagnostic testing they had received. Potential researcher bias is a limitation in any patient-reported study methodology, and it should be noted that due to using the snowballing methodology to attain an additional patient and caregiver into the study, this does add to the selection bias of our sample. All interviewed patients had experienced an attack within the past 2 years and had received treatment to manage their attacks; the fact that these were recent attacks may have introduced bias.

Due to the limited number of patients included in this study, subgroup analyses of disease impact scores (Fig. 4) by frequency of attacks could not draw statistical conclusions. Additionally, the number of caregivers within this study was too small to draw any generalizable findings; future work would benefit from looking at a wider caregiver population. This study was designed to establish an understanding of the burden of illness for patients and caregivers, not to explore the effect of time or disease progression on the burden of illness.


The results of this study provide a snapshot of the burden of AHP and the impact of both acute attacks and chronic symptoms on the lives of a heterogeneous patient population and their caregivers. The qualitative semi-structured interviews provide an in-depth picture of the burden of AHP and support the quantitative results provided by the survey. Further work is needed in the field of AHP to improve the definition of disease burden. It is clear from the results of this analysis that the burden of illness with AHP is high for all patients and caregivers, regardless of the frequency of attacks experienced, and there remain many unmet needs within this population.



Patient and caregiver data were collected via an online survey of members of the British Porphyria Association (BPA) and/or Porphyria UK, followed by an optional 1-h telephone in-depth interview.

Purposive sampling was used for both phases using pre-defined selection criteria. Eligibility was confirmed through questions integrated within the survey (Table 12). All patients were included within the survey results regardless of their previous experience of acute manifestations. In addition, snowball sampling via interview participants was used to increase participation in the interviews [16]. All interview participants completed the survey. An overview of the study methodology is provided in Fig. 6. Adverse event reporting was carried out and all personal information was handled in accordance with the General Data Protection Regulation 2018. The study received approval from the Reading Independent Ethics Committee.

Table 12 Patient eligibility criteria for the survey and interview phases
Fig. 6
figure 6

aTable 12 contains the inclusion and exclusion criteria for both the survey and the interviews. bOne patient and one primary caregiver were obtained via snowball sampling. cThe BPA membership contained 270 members associated with AHP

Mixed-method study design.

Data analysis

Patient and caregiver responses from the online survey were analyzed using descriptive statistics. Missing data or incomplete responses were analyzed up to the questions that were completed, meaning n varies per survey question. Qualitative data from the interviews were thematically analyzed within a pre-defined coding framework, developed and agreed by two independent researchers. Both deductive and inductive coding was used, and newly emerging themes were discussed between the two researchers. Transcripts were coded, applying the coding framework in NVivo©.

Availability of data and materials

All relevant data used in this study have been included in the manuscript. The corresponding author can be contacted if any further information is needed.



Accident & Emergency


Annualized attack rate


Aminolevulinic acid dehydratase deficiency porphyria


Acute hepatic porphyria


Acute intermittent porphyria


Aminolevulinic acid


British Porphyria Association


Emergency department


Gonadotropin-releasing hormone


Hereditary coproporphyria


Intensive care unit




Not applicable




Standard deviation


Transcutaneous electrical nerve stimulation


Variegate porphyria


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The mixed-methods study was conducted in collaboration with the BPA. The BPA is a national charity, registered in 2001, for people with porphyria. It aims to support and educate patients, relatives, and medical professionals about the porphyrias, to improve the lives of those living with its effects. Medical writing support was provided by Emma Hargreaves, Axiom, UK, who was contracted by BresMed.


Alnylam Pharmaceuticals funded the study and the writing of the manuscript.

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Authors and Affiliations



NM and MS were involved in study design, collection, analysis and interpretation of data, and writing the full report and this manuscript. LG, SB and JC, members of the BPA, were involved in the study design, recruitment, and interpretation of anonymized data, and writing and review of this manuscript. SL, JM, MM, SM and JK were involved in study design, interpretation of anonymized data, and writing and review of this manuscript. Alnylam Pharmaceuticals was not involved in the recruitment, data collection, or analysis of raw data, and all results were anonymized. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Stephen Lombardelli.

Ethics declarations

Ethics approval and consent to participate

Consent was obtained from the participants via a survey question and verbal consent was obtained before conducting the interviews. Reading Independent Ethics Committee provided a favorable ethical opinion on December 31, 2018, reference number RIEC111218-2.

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Competing interests

NM and MS are employees of BresMed Health Solutions Ltd. SL, a vendor employed by Alnylam Pharmaceuticals to complete this research. JM, MM, SM and JK are employees of Alnylam Pharmaceuticals. LG, SB and JC are executive leaders and members of the BPA.

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Supplementary Information

Additional file 1: Table S1.

Reported annualized attack rate for patients interviewed.

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Gill, L., Burrell, S., Chamberlayne, J. et al. Patient and caregiver experiences of living with acute hepatic porphyria in the UK: a mixed-methods study. Orphanet J Rare Dis 16, 187 (2021).

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