1. Spaarne Hospital; Hoofddorp, and Maastricht University Medical Centre; Maastricht The Netherlands
2. CSL Behring GmbH; Marburg Germany
3. CSL Behring LLC; King of Prussia PA USA
4. AZ St-Lucas; Gent Belgium
5. Department of Neurology; Universitätsklinikum Würzburg; Würzburg Germany
6. UZ Leuven; Leuven Belgium
7. Department of Neurology; Helsinki University Central Hospital; Helsinki Finland
8. Dolnośląski Szpital Specjalistyczny; Wroclaw Poland
9. Samodzielny Publiczny Szpital Kliniczny; Lublin Poland
10. Department of Neurology; Philipps University; Marburg Germany
11. Reference Center for Rare Neuromuscular Diseases; Hôpital Pitié-Salpêtrière, and University Paris VI; Paris France