1. Department of Surgery and Cancer, Imperial College London , London , UK
2. Department of Orthopaedic Surgery, University of Verona , Verona , Italy
3. University of Birmingham Medical School, University of Birmingham , Birmingham , UK
4. Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford , Oxford , UK
5. Warwick Clinical Trials Unit, University of Warwick , Warwick , UK
6. Department of Plastic, Reconstructive and Hand Surgery, Stoke Mandeville Hospital , Aylesbury , UK