1 Australian Collaboration for Research into Injury in Sport and its Prevention (ACRISP), Federation University Australia, Ballarat, Victoria, Australia.
2 Faculty of Health Sciences, Division of Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town, Cape Town, Western Cape, South Africa.
3 Department of Public & Occupational Health and the EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, The Netherlands.
4 South African Rugby Union, Cape Town, Western Cape, South Africa.