<p> S. G. Nigatu<strong>3,</strong>T. T. Geremew<strong>2</strong>, A. A. Berneh<strong>2</strong>, M. F. Andargie<strong>3,</strong> D. F. Teshome<strong>3</strong></p><p>1Field Epidemiology and Laboratory training program current trainee at University of Gondar, Gondar, Ethiopia</p><p>2Amhara Public Health Institute, Bahir Dar, Ethiopia</p><p>3Department of Epidemiology and Biostatistics, Institute of Public Health, College of Medicine and Health Science, University of Gondar, Gondar, Ethiopia</p>