- Correspondence to Nicholas Tam, UCT/MRC Research Unit for Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town, PO Box 115, Newlands, Cape Town 7725, South Africa;
- Accepted 4 September 2013
- Published in print 1 March 2014.
- Published online 11 February 2014.
- Published first 9 October 2013.
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