1. Policy and Planning Directorate, Federal Ministry of Health (FMOH), P.O. Box 50332, Addis Ababa, Ethiopia
2. Department of Public Health, College of Health and Medical Sciences, Haramaya University, P.O. Box 235, Harar, Ethiopia
3. School of Public Health, College of Medical Sciences, Addis Ababa University, P.O. Box 3253, Addis Ababa, Ethiopia