1. Department of Environmental Management, Pan African University, Life and Earth Sciences Institute (including Health and Agriculture), Ibadan, Nigeria
2. National Institute for Medical Research, Dar es Salaam, Tanzania
3. Department of Petroleum and Energy Engineering, College of Earth Science, the University of Dodoma, Dodoma, Tanzania
4. Department of Geology, Pan African University Life and Earth Sciences Institute, University of Ibadan, Nigeria
5. Department of Physics, University of Dodoma, Dodoma, Tanzania