1. Department of Biostatistics, School of Public Health, College of Health Sciences, Mekelle University, Mekelle, Tigray, Ethiopia
2. Department of Medical Microbiology and Immunology, Biomedical Division, School of Medicine, College of Health Sciences, Mekelle University, Mekelle, Tigray, Ethiopia
3. Department of Reproductive Health, School of Public Health, College of Health Sciences, Mekelle University, Mekelle, Tigray, Ethiopia