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1 Unité de pathologie neuromusculaire, institut de myologie, hôpital Pitié-Salpêtrière, 47/83, boulevard de l'Hôpital, 75651 Paris cedex 13, France. Electronic address: anne-marie.maronne@psl.aphp.fr.
2 Service de neurologie A, hôpital Nord, avenue Albert-Raimond, 42055 Saint-Étienne cedex, France.
1 Unité de pathologie neuromusculaire, institut de myologie, hôpital Pitié-Salpêtrière, 47/83, boulevard de l'Hôpital, 75651 Paris cedex 13, France. Electronic address: anne-marie.maronne@psl.aphp.fr.
2 Service de neurologie A, hôpital Nord, avenue Albert-Raimond, 42055 Saint-Étienne cedex, France.