[1] Univ Oxford, Oxford Natl Inst Hlth Res NIHR, Musculoskeletal Biomed Res Unit, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Oxford, England
[2] UCL, Dept Primary Care & Populat Hlth, London, England
[3] Spanish Agcy Med & Med Devices AEMPS, BIFAP Res Unit, Div Pharmacoepidemiol & Pharmacovigilance, Med Human Use Dept, Madrid, Spain
[4] Univ Manchester, Hlth eRes Ctr, Farr Inst Hlth Informat Res, Manchester, Lancs, England