1. Departments of Physical Therapy, Orthopaedic Surgery, and Rheumatology, Virginia Commonwealth University, Richmond, Virginia, USA
2. School of Health and Social Care, Edinburgh Napier University, Edinburgh, UK
3. School of Public Health, Temple University, Philadelphia, Pennsylvania, USA
4. Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK