1. Discipline of Public Health Medicine, School of Nursing & Public Health, University of KwaZulu-Natal, Durban 4041, South Africa
2. Department of Health Promotion & Education, Boitekanelo College, Tlokweng, Old Naledi Kiosk, Gaborone P.O. Box 203156, Botswana
3. Department of Public Health, School of Healthcare Sciences, Sefako Makgatho Health Sciences University, Pretoria 0208, South Africa
4. Cancer & Infectious Diseases Epidemiology Research Unit (CIDERU), College of Health Sciences, University of KwaZulu-Natal, Durban 4001, South Africa