1. Department of Neuropediatrics and Muscle Disorders, Medical Center – University of Freiburg, Freiburg, Germany
2. The John Walton Muscular Dystrophy Research Centre and MRC Centre for Neuromuscular Diseases, Institute of Genetic Medicine, Newcastle University, International Centre for Life, Central Parkway, Newcastle upon Tyne, UK
3. National Rehabilitation Center for Neuromuscular Diseases, Aarhus, Denmark
4. Institute for Medical Biometry and Statistics, Faculty of Medicine and Medical Center - University of Freiburg, Freiburg, Germany
5. Medical University of Sofia, Department of Neurology, University Hospital Sofiamed and Bulgarian Neuromuscular Disorders Society, Sofia, Bulgaria
6. Medical University of Sofia, Department of Neurology, University Hospital Alexandrovska and Bulgarian Neuromuscular Disorders Society, Sofia, Bulgaria
7. Department of Neurology, Medical University of Warsaw, Warsaw, Poland
8. Department of Paediatric Neurology, University Hospital in Brno and Faculty of Medicine, Masaryk University Brno, Czech Republic
9. Institute of Biostatistics and Analyses, Masaryk University Brno, Czech Republic
10. Department of Molecular Genetics and Diagnostics, National Institute of Environmental Health, Budapest, Hungary
11. Department of Pediatrics, Semmelweis University, Budapest, Hungary