1. Department of Population and Health, University of Cape Coast, Private Bail Box, UCC, Cape Coast, Ghana
2. College of Public Health, Medical and Veterinary Services, James Cook University, QLD 4811, Australia
3. School of Public Health, Faculty of Health, University of Technology Sydney, Sydney NSW 2007, Australia
4. School of International Development and Global Studies, University of Ottawa, Ottawa ON K1N 6N5, Canada
5. The George Institute for Global Health, Imperial College London, London W12 OBZ UK, UK