1. Department of Family Medicine, University of the Witwatersrand, Johannesburg, South Africa
2. Principal Family Physician, Eastern Cape District Clinical Specialist Team, Port Elizabeth, South Africa
3. Department of Biochemistry and Microbiology, University of Zululand, KwaDlangezwa, South Africa
4. Department of Physiology and Biochemistry, National Sports Academy, Sofia, Bulgaria
5. Department of Family Medicine, University of the Witwatersrand,Johannesburg, South Africa