1. Department of Preventive and Social Medicine, Faculty of Clinical Sciences, College of Health Sciences, University of Port Harcourt, Choba, Nigeria
2. Department of Public Health Services, Rivers State Ministry of Health, Port Harcourt, Nigeria
3. Institute of Geo-Science and Space Technology, Rivers State University, Oroworukwo, Nigeria
4. Department of Public Health, Faculty of Sciences and Technology, Cavendish University Uganda, Kampala, Uganda
5. Center for Occupational Health and Safety, Institute of Petroleum Studies, University of Port Harcourt, Choba, Nigeria