1. Institute for Global Health and Development, Queen Margaret University, Edinburgh EH21 6UU, UK
2. Department of Health Management and Policy, Faculty of Health Sciences, American University of Beirut, P.O. Box 11-0236, Riad El-Solh/Beirut 1107 2020, Lebanon
3. Department of Epidemiology and Population Health, Faculty of Health Sciences, American University of Beirut, P.O. Box 11-0236, Riad El-Solh/Beirut 1107 2020, Lebanon