<p>Chalachew Yenew<strong>*</strong>1,Asay Alamneh Gebeyehu2</p><p><strong>Affiliations</strong></p><p>1*Department of Public Health, College of Health Sciences, Debre Tabor University, Debre Tabor, Ethiopia</p><p>2Depatment of Biostatistics, College of health science,Debre Tabor University, Debre Tabor, Ethiopia.</p>