1. Stanmore Royal National Orthopaedic Hospital, Stanmore, Middlesex, United Kingdom
2. Division of Surgery & Interventional Science, UCL, London, United Kingdom
3. Dalhousie University and Queen Elizabeth II Health Sciences Center, Halifax, Nova Scotia, Canada
4. Northern General Hospital, Sheffield, United Kingdom
5. Dalhousie University and Memorial University of Newfoundland, Fredericton, New Brunswick, Canada
6. University of Calgary, Calgary, Alberta, Canada
7. St. George’s Hospital, London, United Kingdom
8. University of Alberta, Edmonton, Alberta, Canada
9. Frimley Park Hospital, Frimley, Camberley, Surrey, United Kingdom
10. Royal Surrey County Hospital, Guildford, Surrey, United Kingdom
11. Department of Orthopaedics, University of British Columbia, Vancouver, British Columbia, Canada
12. Division of Orthopaedic Surgery, St. Michael’s Hospital, Toronto, Ontario, Canada
13. Department of Orthopaedics, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA