1 Division of Physiological Sciences and Health through Physical Activity, Lifestyle and Sport Research Centre, Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Cape Town, Western Cape, South Africa sharief.hendricks01@gmail.com.
2 Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds Beckett University, Leeds, UK.
3 Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.
4 Integrated Concussion Research Program, University of Calgary, Calgary, Alberta, Canada.
5 Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada.
6 Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada.
7 O'Brien Institute for Public Health, University of Calgary, Calgary, Alberta, Canada.
8 Departments of Pediatrics, Cumming School of Medicine, Calgary, Alberta, Canada.
9 Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.
10 McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Alberta, Canada.
11 Division of Physiological Sciences and Health through Physical Activity, Lifestyle and Sport Research Centre, Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Cape Town, Western Cape, South Africa.
12 Premiership Rugby, London, UK.
13 England Performance Unit, Rugby Football League, Manchester, UK.
14 School of Behavioural and Health Sciences, Faculty of Health Sciences, Australian Catholic University, Brisbane, QLD, Australia.
15 Institute of Sport and Exercise Medicine, Department of Exercise, Sport and Lifestyle Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University, Stellenbosch, South Africa.
16 Discipline of Physiotherapy, School of Medicine, Trinity College Dublin, Dublin, Ireland.
17 Centre for Health, and Injury & Illness Prevention in Sport, University of Bath, Bath, UK.
18 UK Collaborating Centre on Injury and Illness Prevention in Sport (UKCCIIS), University of Bath, Bath, UK.