- Correspondence to Professor Wayne Derman, Division of Orthopaedic Surgery, Faculty of Medicine and Health Science, Institute of Sport and Exercise Medicine, Stellenbosch University, Francie van Zijl Drive, Bellville, Cape Town, 7505, South Africa;
- Accepted 6 October 2017
- Published in print 1 January 2018.
- Published online 18 December 2017.
- Published first 26 October 2017.
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