1. Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis, Oxford, United Kingdom of Great Britain and Northern Ireland
2. British Horseracing Authority Ltd, Medical, London, United Kingdom of Great Britain and Northern Ireland
3. Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom of Great Britain and Northern Ireland
4. Department of Health, University of Bath, Bath, United Kingdom of Great Britain and Northern Ireland
5. Department of Primary Care and Population Health, Institute of Epidemiology and Health Care, University College London, London, United Kingdom of Great Britain and Northern Ireland