[1] Tampere Univ Hosp, Dept Trauma Musculoskeletal Surg & Rehabil, Div Orthopaed & Traumatol, Tampere 33520, Finland
[2] UKK Inst, Bone Res Grp, Tampere, Finland
[3] Univ British Columbia, Dept Family Practice, Vancouver, BC V5Z 1M9, Canada
[4] Univ British Columbia, Ctr Hip Hlth, Vancouver, BC V5Z 1M9, Canada
[5] Univ Jyvaskyla, Dept Hlth Sci, Jyvaskyla, Finland