[1] Univ Oxford, Oxford NIHR Musculoskeletal Biomed Res Unit, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Oxford, England
[2] Univ Oxford, Nuffield Dept Populat Hlth, Oxford, England
[3] Univ Southampton, MRC Lifecourse Epidemiol Unit, Southampton, Hants, England
[4] Northern Gen Hosp, Metab Bone Ctr, Acad Unit Bone Metab, Sheffield, S Yorkshire, England
[5] Univ Sheffield, Acad Unit Child Hlth, Sheffield, S Yorkshire, England
[6] Univ Oxford, NIHR Oxford Musculoskeletal BRU, Botnar Res Ctr, Oxford OX3 7HE, England