1. National Neuroscience Institute; Department of Neurology; 11 Jalan Tan Tock Seng Singapore Singapore 308433
2. National Hospital for Neurology and Neurosurgery; MRC Centre for Neuromuscular Diseases; PO Box 114 Queen Square London UK WC1N 3BG
3. Milan University; IRCCS Humanitas Clinical Institute, Neurology 2; Istituto Clinico Humanitas Via Manzoni 56, Rozzano Milan Italy 20089
4. Groupe Hospitalier Pitrie Salpêtrière and University Paris VI; National Reference Center for Rare Neuromuscular Diseases; Bâtiment Balinski 47-83 Boulevard de l'Hôpital Paris Cedex 13 France 75651