1. Department of Psychiatry, College of Health and Medical Science, Haramaya University, Harar, Ethiopia
2. Department of Psychiatry, College of Medicine and Health Science, University of Gondar, Gondar, Ethiopia
3. Amanuel Specialized Mental Hospital, Addis Ababa, Ethiopia
4. Department of Epidemiology and Biostatistics, Institute of Public Health, College of Medicine and Health Science, University of Gondar, Gondar, Ethiopia