1. Ambo University, College of Medicine and Health Science, Department of Public Health, P.O. Box 19 Ambo, Ethiopia
2. Addis Ababa University, College of Health Science, Department of Medical Radiological Technology, P.O. Box 11950 Addis Ababa, Ethiopia
3. Kotebe Metropolitan University, Menelik II Health Science and College of Medicine, Addis Ababa, Ethiopia
4. Addis Ababa University, College of Health Sciences, School of Public Health, P.O. Box 11950 Addis Ababa, Ethiopia
5. Ambo University, College of Medicine and Health Science, Department of Midwifery, P.O. Box 19 Ambo, Ethiopia
6. Addis Ababa University, College of Health Science, School of Public Health, P.O. Box 27285 1000 Addis Ababa, Ethiopia