1. Department of Trauma and Orthopaedic Surgery, University College Hospital, London, UK
2. Department of Orthopaedic Surgery, The Princess Grace Hospital, London, UK
3. Institute of Sports, Health and Exercise, University College Hospital, London, UK
4. Department of Trauma and Orthopaedic Surgery, Young Adult Hip Service, Addenbrooke’s - Cambridge University Hospital, Cambridge, UK
5. Department of Trauma and Orthopaedic surgery, Glasgow University, Glasgow, UK