[1] Curtin Univ, Sch Physiotherapy & Exercise Sci, GPO Box 1987, Perth, WA 6845, Australia
[2] Johns Hopkins Univ, Johns Hopkins Bloomberg Sch Publ Hlth, 615 N Wolfe St,E8539, Baltimore, MD 21205 USA
[3] Lund Univ, Dept Clin Sci, Malmo, Sweden
[4] Skane Univ Hosp, Dept Geriatr, Clin & Mol Osteoporosis Res Unit, Malmo, Sweden
[5] Publ Hlth England, Hlth Improvement Directorate, Prior & Programmes Div, Wellington House,133-155 Waterloo Rd, Waterloo SE1 8UG, England
[6] Royal Cornwall Hosp, Bone & Joint Res Grp, Truro TR1 3HD, England