<p>Ejigu Gebeye Zeleke, Department of Epidemiology and Biostatistics, institute of public health, College of medicine and health sciences, University of Gondar, Ethiopia</p><p>Fantahun Ayenew Mekonen, Department of Epidemiology and Biostatistics, institute of public health, College of medicine and health sciences, University of Gondar, Ethiopia</p><p>Mesafint Fekadu Andargie ,Ethiopian Field Epidemiology and Laboratory Training Program Residence Advisory at University of Gondar, College of Medicine and Health Sciences, Gondar, Ethiopia</p>