1. Department of Neurology University of Minnesota Minneapolis MN USA
2. Immunology Research and Development, CSL Behring King of Prussia PA USA
3. Neuromuscular Diseases Unit, Department of Neurology Hospital de la Santa Creu i Sant Pau, Universitat Autònoma de Barcelona Barcelona Spain
4. Centro para la Investigación Biomédica en Red en Enfermedades Raras (CIBERER) Madrid Spain
5. Department of Neurology Erasmus MC University Medical Center Rotterdam The Netherlands
6. Department of Neurology Albert Schweitzer Hospital Dordrecht The Netherlands
7. Department of Neurology King's College Hospital London UK