[1] Grp Hosp Pitie Salpetriere, AP HP, Serv Rhumatol, F-75634 Paris, France
[2] Univ Paris 06, UFR Med, Paris, France
[3] Univ Montpellier I, UFR Med, Inst Univ Rech Clin, Montpellier, France
[4] Nancy Univ, EA 4360, APEMAC, Ecole Sante Publ,Fac Med Nancy, Nancy, France
[5] CHU Nancy, INSERM, CIC EC Ctr Epidemiol Clin, Nancy, France
[6] Ctr Hosp Univ Montpellier, Hop Lapeyronie, Serv Rhumatol, Montpellier, France
[7] Hop St Antoine, AP HP, Serv Rhumatol, F-75571 Paris, France