1. Institute of Human Genetics; Center for Molecular Medicine Cologne; Institute of Genetics, and Center for Rare Diseases Cologne; University of Cologne; Cologne Germany
2. Cologne Center for Genomics (CCG); University of Cologne; Cologne Germany
3. Dokuz Eylül University; Department of Pediatric Neurology; Izmir Turkey
4. Mashhad University of Medical Sciences; Department of Neurology; Mashhad Iran
5. Next Generation Genetic Polyclinic; Mashhad Iran
6. Razavi Cancer Research Center; Razavi Hospital; Imam Reza International University; Mashhad Iran
7. University Hospital Cologne; Department of Neurology; Cologne Germany
8. Hacettepe University; Department of Pediatric Neurology; Ankara Turkey
9. Department of Neuropediatrics and Muscle Disorders; Faculty of Medicine; Medical Center; University of Freiburg; Freiburg Germany
10. DKD HELIOS Kliniken; Department of Neurology; Wiesbaden Germany
11. Genetics and Molecular Cell Sciences Research Centre; St George's University of London; London UK
12. deCODE Genetics/Amgen, Inc; Reykjavik Iceland