[1] Univ Hosp Udine, Dept Med & Biol Sci, Rheumatol Clin, Udine, Italy
[2] Univ Paris Sud, Hop Univ Paris Sud, AP HP, INSERM,U1012, Paris, France
[3] Univ Hosp Udine, Rheumatol Clin, Udine, Italy
[4] Univ Paris 05, Hotel Dieu Hosp, AP HP, Ctr Clin Epidemiol,Fac Med,INSERM,U738, Paris, France
[5] Univ Hosp Udine, Inst Pathol, Udine, Italy
[6] Inst Stat, Dept Med & Biol Sci, Udine, Italy