1 Centre for Epidemiology Versus Arthritis, Division of Musculoskeletal and Dermatological Science, School of Biological Sciences, Faculty of Biological Medicine and Health, The University of Manchester, Manchester Academic Health Science Centre, Manchester, UK.
2 Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, UK.
3 National Institute for Health Research Leeds Biomedical Research Centre, Leeds Teaching Hospitals, University of Leeds, Leeds, UK.
4 MRC Integrative Epidemiology Unit, University of Bristol, Bristol, UK.
5 Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK.