1. Department of Environmental and Occupational Health and Safety, College of Medicine and Health Sciences, Institute of Public Health, University of Gondar, Gondar, Ethiopia;
2. Department of Public Health, St. Paul’s Hospital Millennium Medical College, Addis Ababa, Ethiopia;
3. School of Medicine, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia;
4. Department of Reproductive Health, College of Medicine and Health Sciences, Institute of Public Health, University of Gondar, Gondar, Ethiopia