1. Research Institute for Primary Care & Health Sciences, Keele University, Keele, UK
2. Clinical Epidemiology Unit, Orthopaedics, Department of Clinical Sciences Lund, Lund University, Lund, Sweden
3. Clinical Epidemiology Research & Training Unit, Boston University School of Medicine, Boston, MA, USA
4. Concord Clinical School, Faculty of Medicine, University of Sydney, Sydney, New South Wales, Australia
5. GREMPAL (Grup de Recerca en Epidemiologia de les Malalties Prevalents de l’Aparell Locomotor), Idiap Jordi Gol Primary Care Research Institute, Universitat Autònoma de Barcelona, Barcelona, Spain
6. Musculoskeletal Pharmaco- and Device Epidemiology, Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, University of Oxford, UK