<p>Mesafint M. Demlew1* N. M. Derseh<strong>2</strong>, M. F. Andargie<strong>2</strong>, A.A. Muche<strong>2</strong></p><p>1Field Epidemiology and Laboratory training program current trainee at University of Gondar, Gondar, Ethiopia</p><p>2 Department of Epidemiology and Biostatistics, Institute of Public Health, College of Medicine and Health Science, University of Gondar, Gondar, Ethiopia</p>