1. School of Nursing and Midwifery, College of Health and Medical Sciences, Haramaya University, Harar, Ethiopia
2. Hararghe Health and Demographic Surveillance Systems, Harar, Ethiopia
3. School of Public Health, College of Health and Medical Sciences, Haramaya University, Harar, Ethiopia
4. Department of statistics, College of Computing and Informatics, Haramaya University
5. Department of Obstetrics and Gynaecology, University Medical Centre Groningen, University of Groningen, the Netherlands