*Sport, Exercise Medicine and Lifestyle Institute (SEMLI) and Section Sports Medicine, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa;
†International Olympic Committee (IOC) Research Centre, Pretoria, South Africa;
‡Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa;
§Biostatistics Unit, South African Medical Research Council, Parow, South Africa;
¶Statistics and Population Studies Department, University of the Western Cape, Cape Town, South Africa; and
║Institute for Sport and Exercise Medicine, Faculty of Medicine & Health Sciences, University of Stellenbosch, Parow, South Africa.
Corresponding Author: Martin P. Schwellnus, Sport, Exercise Medicine and Lifestyle Institute (SEMLI) and Section Sports Medicine, Faculty of Health Sciences, University of Pretoria, Sports Campus, Burnett St, Hatfield, Pretoria 0020, South Africa ([email protected]).
The study was partially funded by a research grant from the International Olympic Committee (IOC) Research Centre (South Africa) at the University of Pretoria. The South African Medical Research Council (SAMRC) provided partial funding for the statistical analysis.
The authors report no conflicts of interest.
Supplemental digital content is available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal's Web site (www.cjsportmed.com).
A. Rotunno: data collection, data interpretation, manuscript (first draft), and manuscript editing. M. Schwellnus: principle investigator, responsible for the overall content as guarantor, study concept, study planning, data collection, data interpretation, manuscript (first draft), manuscript editing, and facilitating funding. S. Swanevelder: study planning, data analysis including statistical analysis, data interpretation, and manuscript editing. E. Jordaan: study planning, data analysis including statistical analysis, data interpretation, and manuscript editing. D. C. Janse Van Rensburg: data interpretation, manuscript (first draft), and manuscript editing. W. Derman: study concept, study planning, data collection, data interpretation, and manuscript editing.
