- Correspondence to Professor Martin P Schwellnus, Sport Exercise Medicine and Lifestyle Institute (SEMLI) and Section Sports Medicine, Faculty of Health Sciences, University of Pretoria, Pretoria 0028, South Africa;
- Received January 26, 2018
- Revised June 8, 2018
- Accepted June 12, 2018
- First published June 29, 2018.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.