[1] Newcastle Univ, Inst Med Genet, Newcastle Upon Tyne NE1 3BZ, Tyne & Wear, England
[2] Univ Munich, Dept Neurol, Friedrich Baur Inst, D-8000 Munich, Germany
[3] Univ Hosp Alexandrovska, Clin Neurol, Sofia, Bulgaria
[4] Univ Essen Gesamthsch, Essen, Germany
[5] Univ Belgrade, Sch Med, Inst Neurol, Belgrade, Serbia
[6] Sahlgrens Univ Hosp, Dept Pathol, Goteborg Neuromuscular Ctr, Gothenburg, Sweden
[7] Univ Fed Parana, Hosp Clin, Neuromuscular Neurol Div, BR-80060000 Curitiba, Parana, Brazil
[8] Hosp St Joan de Deu, Unitat Patol Neuromuscular, Barcelona, Spain
[9] Univ Hosp, Serv Neurol, Valencia, Spain
[10] Politecn La Fe, Valencia, Spain
[11] CIBER Enfermedades Neurodegenerat CIBERNED, Madrid, Spain
[12] Hadassah Univ Hosp, Dept Neurol, IL-91120 Jerusalem, Israel