1. Faculty of Public Health, Ghana College of Physicians and Surgeons, Accra, Ghana.
2. Ghana Health Service, Accra, Ghana.
3. Research and Development Division, Ghana Health Service, Accra, Ghana.
4. School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa.
5. Department of Global Health and Development, London School of Hygiene and Tropical Medicine, London, UK.