[1] Inst Pasteur, INSERM U508, F-59019 Lille, France
[2] Assistance Publ Hop Paris, Ctr Hosp Emile Roux, Serv Gerontol Clin, Limeil Brevannes, France
[3] Assistance Publ Hop Paris, Creteil, France
[4] Ctr Hosp Henri Mondor, Serv Neuroradiol, Creteil, France
[5] Hop Paul Brousse, INSERM U258, Villejuif, France