[1] Erasmus MC, Rotterdam, Netherlands
[2] Erasmus MC, Rotterdam, ZH, Netherlands
[3] Univ Med Ctr, Erasmus MC, Dept Immunol & Neurol, Rotterdam, Netherlands
[4] Kings Coll Hosp London, London, England
[5] Britanico Hosp, Buenos Aires, DF, Argentina
[6] Univ Hosp St Luc, Dept Neurol, Neuromuscular Reference Ctr, Brussels, Belgium
[7] Chiba Univ, Chiba, Japan
[8] Univ Malaya, Kuala Lumpur, Malaysia