[1] Fdn Ist Neurol Carlo Besta, Milan, Italy
[2] Duke Univ, Sch Med, Durham, NC USA
[3] Univ Toronto, Div Neurol, Toronto, ON, Canada
[4] Hosp Univ Vall Hebron, Neuromuscular Unit, Barcelona, Spain
[5] Heinrich Heine Univ Dusseldorf, Dusseldorf, Germany
[6] Hosp Gen Univ Gregorio Maranon, Serv Neurol, Madrid, Spain
[7] Yale Univ, Sch Med, New Haven, CT USA
[8] Univ Colorado, Sch Med, Aurora, CO USA
[9] Hosp Univ Politecn La Fe, Valencia, Spain
[10] Jagiellonian Univ, Med Coll, Krakow, Poland
[11] Momenta Pharmaceut, Cambridge, MA USA