Correction to: Orphanet Journal of Rare Diseases (2020) 15:48 https://doi.org/10.1186/s13023-020-1319-7
In the original article , data labelling in Fig. 2 was incorrect by mistake. The total number of patients with data on neurological outcome available was n = 139. The corrected figure is shown below.
The figure legend should read:
The paragraph on the neurological outcome on page 3 also contains one wrong number and should read “Information on the neurologic outcome was available on 140 patients (Fig. 2). One 2-year-old patient had trisomy 21  and was therefore not included in the analysis. 86 (86/139; 61.9%) showed normal psychomotor development without neurologic abnormalities. In 9 patients (9/139; 6.5%) only slight abnormalities were reported…”
The authors apologize for these errors and state that these do not change the scientific conclusions of the article in any way.