[1] Fdn IRCCS Ist Neurol Besta, Dev Neurol Unit, Milan, Italy
[2] UCL Great Ormond St Inst Child Hlth, Dubowitz Neuromuscular Ctr, London, England
[3] Ctr Hosp Reg Citadelle, Reference Ctr Neuromuscular Dis, Liege, Belgium
[4] Univ Oxford, MDUK Oxford Neuromuscular Ctr, Dept Paediat, Oxford, England
[5] Med Univ Gdansk, Dept Dev Neurol, Gdansk, Poland
[6] Childrens Hosp Westmead, Paediat Gait Anal Serv New South Wales, Sydney, NSW, Australia
[7] Pirogov Russian Natl Res Med Univ, Veltischev Clin Pediat Res Inst, Russian Children Neuromuscular Ctr, Moscow, Russia
[8] Peking Univ First Hosp, Dept Pediat, Beijing, Peoples R China
[9] Univ Sao Paulo, Hosp Clin, Dept Neurol, Sao Paulo, Brazil
[10] Roche Prod Ltd, Welwyn Garden City, Herts, England
[11] F Hoffmann La Roche Ltd, Pharma Dev Neurol, Basel, Switzerland
[12] F Hoffmann La Roche Ltd, Pharma Dev, Safety, Basel, Switzerland
[13] F Hoffmann La Roche Ltd, PDMA Neurosci & Rare Dis, Basel, Switzerland
[14] Roche Innovat Ctr Basel, Roche Pharmaceut Res & Early Dev, Basel, Switzerland
[15] Harvard Med Sch, Boston Childrens Hosp, Boston, MA 02115 USA