1 MRC Lifecourse Epidemiology Centre, University of Southampton, Southampton, UK. nch@mrc.soton.ac.uk.
2 NIHR Southampton Biomedical Research Centre, University of Southampton and University Hospital, Southampton NHS Foundation Trust, Southampton, UK. nch@mrc.soton.ac.uk.
3 Metabolic Bone Disease Unit, Addenbrooke's Hospital, Cambridge, UK.
4 Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, UK.
5 Centre for Metabolic Bone Diseases, University of Sheffield, Sheffield, UK.
6 MRC Versus Arthritis Centre for Integrated Research in Musculoskeletal Ageing, Mellanby Centre for Musculoskeletal Research, University of Sheffield, Sheffield, UK.
7 Royal Osteoporosis Society, Bath, UK.
8 Centre for Endocrinology, Diabetes and Metabolism (CEDAM), University of Birmingham, Birmingham, UK.
9 Department of Medicine, Cambridge Biomedical Campus, University of Cambridge, Cambridge, UK.