[1] Univ Liege, Dept Epidemiol & Publ Hlth, Liege, Belgium
[2] Odense Univ Hosp, DK-5000 Odense, Denmark
[3] Osped La Colletta, Dept Rheumatol, Arenzano, Italy
[4] Klinikum Hannover Nordstadt, Hannover, Germany
[5] Univ Debrecen, Dept Obstet & Gynaecol, Debrecen, Hungary
[6] Childrens Memoroal Hlth Inst, Warsaw, Poland
[7] Hosp Univ Cent Asturias, Bone & Mineral Res Unit, Oviedo, Spain
[8] N Hosp, Dept Rheumatol, Amiens, France