[1] University of Gondar,Department of Epidemiology and Biostatistics, Institute of Public Health, College of Medicine and Health Sciences
[2] University of Gondar,Department of Human Anatomy, College of Medicine and Health Sciences
[3] University of Gondar,Department of Women’s and Family Health, School of Midwifery, College of Medicine and Health Sciences
[4] University of Gondar,Department of Human Physiology, College of Medicine and Health Sciences