[1] Univ Hosp Pellenberg, Div Orthoped, Dept Musculoskeletal Sci, B-3212 Pellenberg, Belgium
[2] Univ Hosp Gasthuisberg, Dept Gen Internal Med, B-3000 Louvain, Belgium
[3] Univ Hosp Gasthuisberg, Div Phys Med & Rehabil, Dept Musculoskeletal Sci, B-3000 Louvain, Belgium
[4] Univ Hosp Gasthuisberg, Div Women & Child, Dept Obstet & Gynaecol, B-3000 Louvain, Belgium