1. GREMPAL Research Group, IDIAP Jordi Gol Primary Care Research Institute, Universitat Autònoma de Barcelona; Barcelona Spain
2. Arthritis Research UK Centre for Sport, Exercise, and Osteoarthritis, Oxford NIHR Musculoskeletal Biomedical Research Unit, Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, and University of Oxford; Oxford UK
3. Research Institute for Primary Care and Health Sciences, Keele University; Keele UK
4. MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton General Hospital, Southampton, UK, and Oxford NIHR Musculoskeletal Biomedical Research Unit, Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, and University of Oxford; Oxford UK
5. MRC Lifecourse Epidemiology Unit, University of Southampton, and Southampton General Hospital, Southampton, UK, and Arthritis Research UK Centre for Sport, Exercise, and Osteoarthritis, Oxford NIHR Musculoskeletal Biomedical Research Unit, Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, and University of Oxford; Oxford UK
6. MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton General Hospital, Southampton, UK, Oxford NIHR Musculoskeletal Biomedical Research Unit, Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, and University of Oxford, Oxford, UK, and GREMPAL Research Group, IDIAP Jordi Gol Primary Care Research Institute, Universitat Autònoma de Barcelona, RETICEF, IMIM Research Foundation, Parc de Salut Mar, and Instituto de Salud Carlos III; Barcelona Spain