1. 1Department of Internal Medicine, College of Medicine and Health Sciences, Wollo University, Dessie, Ethiopia;
2. 2Boru Meda Hospital, Dessie, Ethiopia;
3. 3Department of Medical Laboratory Science, College of Medicine and Health Sciences, Wollo University, Dessie, Ethiopia;
4. 4Institute of Public Health, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia;
5. 5Institute of Tropical Medicine, Antwerp, Belgium