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Musculoskeletal Research Unit (C.L.G., J.H.T.), School of Clinical Sciences, University of Bristol, Bristol BS10 5NB, United Kingdom; Medical Research Council (MRC) Lifecourse Epidemiology Unit (C.L.G.), University of Southampton, Southampton, SO16 6YD United Kingdom; Department of Medicine (K.E.S.P.), University of Cambridge, Cambridge, CB2 0SP United Kingdom; Metabolic Bone Centre (E.V.M.), Sheffield University, Sheffield, S3 7HF United Kingdom; Human Genetics Group (E.L.D.), University of Queensland Diamantina Institute, Brisbane, Australia; Department of Endocrinology (E.L.D), Royal Brisbane and Women's Hospital, Brisbane, Australia; Institute of Aerospace Medicine (J.R.), German Aerospace Center (Deutschen Zentrums fuür Luft- und Raumfahrt), Cologne, Germany; Institute for Biomedical Research into Human Movement and Health Research Institute (J.R.), Manchester Metropolitan University, Manchester, M1 5GD United Kingdom; Department of Medicine (W.D.F.), Norwich Medical School, University of East Anglia, Norwich, NR4 7TJ United Kingdom; and MRC Integrative Epidemiology Unit (G.D.S.), School of Social and Community Based Medicine, University of Bristol, Bristol, BS8 2BN United Kingdom.