[1] Clin Hosp Dr I Cantacuzino, Dept Rheumatol, Bucharest, Romania
[2] Univ Hosp, Dept Trauma Surg, Maastricht, Netherlands
[3] Acad Hosp Maastricht, Dept Rheumatol, Maastricht, Netherlands
[4] Acad Hosp Maastricht, Dept Epidemiol, Maastricht, Netherlands
[5] Univ Hosp, Dept Med & Rheumatol, Maastricht, Netherlands
[6] Hasselt Univ, Biomed Res Ctr, Diepenbeek, Belgium