1. Oxford National Institute for Health Research (NIHR) Musculoskeletal Biomedical Research Unit, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal SciencesUniversity of OxfordOxfordUK
2. Health Economics Research Centre, Nuffield Department of Population HealthUniversity of OxfordOxfordUK
3. Medical Research Council (MRC) Lifecourse Epidemiology UnitUniversity of Southampton, Southampton General HospitalSouthamptonUK
4. Hospital del Mar Medical Research Institute (IMIM)Universitat Autònoma de Barcelona and Red Tematica de Investigacion Cooperativa en Envejecimiento y Fragilidad (RETICEF), Instituto de Salud Carlos IIIBarcelonaSpain
5. Grup de Recerca en Malalties Prevalents de I'Aparell Locomotor (GREMPAL) Research Group, Institut d'Investigacio en Atencio Primaria (IDIAP) Jordi Gol Primary Care Research InstituteUniversitat Autònoma de BarcelonaBarcelonaSpain