Nowhere to hide: The significant impact of coronavirus disease 2019 (COVID-19) measures on elite and semi-elite South African athletes - Pillay, L.; Janse van Rensburg, D. C. C.; Jansen van Rensburg, A.; Ramagole, D. A.; Holtzhausen, L.; Dijkstra, H. P.; Cronje, T. (Journal of Science and Medicine in Sport, 2020)