Wayne Derman1,2, Phoebe Runciman1,2, Esme Jordaan3,4, Martin Schwellnus2,5, Cheri Blauwet6, Nick Webborn7, Jan Lexell8, Peter van de Vliet9, James Kissick10, Jaap Stomphorst11, Young-Hee Lee12, Keun-Suh Kim13. 1. Institute of Sport and Exercise Medicine, Division of Orthopaedics, Department of Surgery, Stellenbosch University, Cape Town, South Africa. 2. IOC Research Centre South Africa, South Africa. 3. Biostatistics Unit, Medical Research Council, Cape Town, South Africa. 4. Statistics and Population Studies Department, University of the Western Cape, Cape Town, South Africa. 5. Sport, Exercise Medicine and Lifestyle Institute, University of Pretoria, Faculty of Health Sciences, Pretoria, South Africa. 6. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital and Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA. 7. Centre for Sport and Exercise Science and Medicine, University of Brighton, Eastbourne, UK. 8. Department of Neuroscience, Rehabilitation Medicine, Uppsala Universitet, Uppsala, Sweden. 9. Medical and Scientific Department, International Paralympic Committee, Bonn, Germany. 10. Carleton University Sport Medicine Clinic, Department of Family Medicine, University of Ottawa, Ottawa, Ontario, Canada. 11. Department of Sports Medicine, Isala Klinieken, Zwolle, The Netherlands. 12. Rehabilitation Medicine, Wonju College of Medicine, Yonsei University, Wonju, The Republic of Korea. 13. Yonsei Institute of Sports Science and Exercise Medicine, Yonsei University, Seodaemun-gu, The Republic of Korea.