1. Department of Dentistry, School of Medicine, College of Medicine and Health Sciences University of Gondar Gondar Ethiopia
2. Department of Internal Medicine, School of Medicine, College of Medicine and Health Sciences University of Gondar Gondar Ethiopia
3. Department of Anatomy, School of Medicine, College of Medicine and Health Sciences University of Gondar Gondar Ethiopia
4. Department of Biostatics and Epidemiology, Institute of Public health, College of Medicine and Health Sciences University of Gondar Gondar Ethiopia
5. Department of Pharmacology, School of Pharmacy, College of Medicine and Health Sciences University of Gondar Gondar Ethiopia
6. Department of Special Need and Inclusive Education, College of Education University of Gondar Gondar Ethiopia
7. School of Public Health, St. Paul's Hospital Millennium Medical College Addis Ababa Ethiopia