[1] Hop G Montpied, Serv Rhumatol, F-63003 Clermont Ferrand, France
[2] INSERM, Equipe Avenir Malad Prions Chez Homme, Paris, France
[3] Grp Hosp Pitie Salpetriere, AP HP, Lab Neuropathol Raymond Escourolle, F-75634 Paris, France
[4] Univ Paris 05, Hop Cochin, AP HP, Serv Rhumatol B, F-75679 Paris, France