1. Homecho Hospital, SNNPRS, Homecho, Ethiopia
2. Institute of Health, Jimma University, Department of Epidemiology, Jimma, Ethiopia
3. Department of Public Health, Wolaita Sodo University, Sodo, Ethiopia
4. Misha District Health Office, SNNPRS, Morsito, Ethiopia
5. Department of Statistics, Wachemo University, Hossana, Ethiopia