1. Division of Exercise Science and Sports Medicine, University of Cape Town, Cape Town, South Africa
2. Health, Physical Activity, Lifestyle and Sport Research Centre, University of Cape Town, Cape Town, South Africa
3. Institute for Sport, Physical Activity and Leisure, Leeds Beckett University, Leeds, UK
4. Institute for Sport and Exercise Medicine, Stellenbosch University, Stellenbosch, South Africa
5. The International Olympic Committee (IOC) Research Centre, Cape Town, South Africa
6. The South African Rugby Union, Cape Town, South Africa
7. Western Province Rugby Union/Stormers, Cape Town, South Africa
8. Department of Public and Occupational Health and the EMGO Institute Health and Care Research, VU University, Amsterdam, Netherlands