Fig. 1From: Development of the Myasthenia Gravis (MG) Symptoms PRO: a case study of a patient-centred outcome measure in rare diseaseStudy design for development of the MG Symptoms PRO, a new PCOM in rare disease. MG myasthenia gravis, PCOM patient-centred outcome measure, PRO patient-reported outcome, RMT Rasch measurement theoryBack to article page