1. 1Department of Health Financing and Economics, Directorate General of Health Planning & Policy, Federal Ministry of Health, Khartoum, Sudan;
2. 2Department of Health Economics, Alsudani Centre for Training in Heal Economics ACTHE, Khartoum, Sudan;
3. 3School of Medicine, Ahfad University for Women, Khartoum, Sudan;
4. 4Medical Research Center, Kateb University, Kabul, Afghanistan;
5. 5Department of Global Health and Development, London School of Hygiene and Tropical Medicine, London, United Kingdom;
6. 6Faculty of Management and Development Studies, University of the Philippines (Open University), Los Baños, Philippines