1. Surgical Intervention Trials Unit, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
2. Department of Psychosomatic Medicine, Center for Internal Medicine and Dermatology, Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
3. Clinical Trials Unit, University of Warwick, Coventry, UK
4. Department of Plastic Surgery, Stoke Mandeville Hospital, Buckinghamshire Hospitals NHS Trust, Aylesbury, UK