<p>Ali M. Wolle1, G.W.Tsegaye 2, A.G.Azene3</p><p>1*Ethiopian Field Epidemiology training program, department of Epidemiology and Biostatistics, School of Public Health, Bahir Dar University, Bahir Dar, Ethiopia; email: <a href="mailto:alimahammed201@gmail.com"><span style="text-decoration: underline;">alimahammed201@gmail.com</span></a>, Telephone :+251933268955</p><p>2Department of Epidemiology and Biostatistics, School of Public Health, Bahir Dar University, Bahir Dar, Ethiopia; email: <a href="mailto:fwudie@gmail.com">fwudie@gmail.com</a>, Telephone :+251920054599</p><p>3Department of Epidemiology and Biostatistics, School of Public Health, Bahir Dar University, Bahir Dar, Ethiopia; email: <a href="mailto:abebaw2516@gmail.com">abebaw2516@gmail.com</a>, Telephone :+251912934463</p>