1. Department of Public Health, College of Medicine and Health Science, Werabe University, Werabe, Ethiopia
2. Water and Health Division, Ethiopian Institute of Water Resources, Addis Ababa University, Addis Ababa, Ethiopia
3. Department of Environmental Health, Institute of Health, Bule Hora University, Bule Hora, Ethiopia
4. Department of Environmental Health, College of Medicine and Health Science, Hawassa University, Hawassa, Ethiopia