[1] Univ Liege, Publ Hlth Epidemiol & Hlth Econ Dept, Liege, Belgium
[2] CHU, Bone & Cartilage Metab Unit, Liege, Belgium
[3] CHC St Joseph, Dept Gynecol, Liege, Belgium
[4] CHU, Dept Stomatol, Liege, Belgium
[5] CHU, Motr Sci Dept, Liege, Belgium
[6] CHU Sart Tilman, Dept Publ Hlth Epidemiol & Hlth Econ, B-4000 Liege, Belgium