1. Hôpital Saint Louis; Departement de Biostatistique et Informatique Médicale; 1 Avenue Claude Vellefaux 75475 Paris France Cedex 10
2. National Hospital for Neurology and Neurosurgery; MRC Centre for Neuromuscular Diseases; PO Box 114 Queen Square London UK WC1N 3BG
3. Hôpital Raymond Poincaré, Assistance Publique - Hôpitaux de Paris; Critical Care Department; 104. Boulevard Raymond Poincaré Garches Ile de France France 92380