[1] Lund Univ, Dept Orthoped, Skane Univ Hosp Malmo, S-22100 Lund, Sweden
[2] Univ Coll London, Royal Natl Orthopaed Hosp, Inst Orthopaed & Musculoskeletal Sci, Stanmore, Middx, England
[3] St Michaels Hosp, Mobil Program, Li Ka Shing Knowledge Inst, Clin Res Unit, Toronto, ON M5B 1W8, Canada
[4] Univ Toronto, St Michaels Hosp, Dept Surg, Toronto, ON M5B 1W8, Canada
[5] Leuven Univ, Div Gerontol & Geriatr, Louvain, Belgium
[6] Leuven Univ, Ctr Musculoskeletal Res, Dept Expt Med, Louvain, Belgium
[7] Univ Florence, Dept Internal Med, Florence, Italy
[8] Univ Glasgow, Western Infirm, Glasgow G11 6NT, Lanark, Scotland
[9] Univ Derby, Sch Hlth, Fac Educ Hlth & Sci, Derby DE22 1GB, England
[10] Univ Toronto, Dept Hlth Policy Management & Evaluat, Toronto, ON, Canada
[11] Int Osteoporosis Fdn, Nyon, Switzerland