[1] Univ Witwatersrand, Fac Hlth Sci, Sch Therapeut Sci, Dept Pharm & Pharmacol, Johannesburg, South Africa
[2] Univ Witwatersrand, Fac Hlth Sci, Sch Publ Hlth, Div Epidemiol & Biostat, Johannesburg, South Africa
[3] Univ Witwatersrand, Fac Hlth Sci, Div Endocrinol & Metab, Carbohydrate & Lipid Metab Res Unit, Johannesburg, South Africa