1 Neurology and Pathology Department of the Movement, University Hospital of Marseille, Timone Hospital, 264, rue Saint-Pierre, 13385 Marseille, France.
2 Department of Neurology A, BP 69, 63003 Clermont-Ferrand, France. Electronic address: franck.durif@uca.fr.
3 Neurology Department, Pitié-Salpêtrière Hospital, 47-83, boulevard, 75013 Paris, France.
4 Department of Neurology, Hautepierre Hospital, 1, avenue de Molière, 67000 Strasbourg, France.