1. Department of Human Physiology, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
2. Department of Human Physiology, College of Medicine and Health Science, Ambo University, Ambo, Ethiopia
3. Department of Environmental Health, College of Medicine and Health Sciences, Wollo University, Dessie, Ethiopia
4. Department of Environmental and Occupational Health and Safety, Institute of Public Health, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia