1. Department of Epidemiology and Medical Statistics, Faculty of Public Health, College of Medicine, University of Ibadan, Ibadan, Nigeria
2. Department of Public Health, Center of Excellence in Reproductive Health Innovation (CERHI), College of Medical Sciences, University of Benin, Benin City, Nigeria
3. Department of Medical Biochemistry, School of Basic Medical Sciences, University of Benin, Benin City, Nigeria
4. Department of Economics, Faculty of Social Sciences, National Open University of Nigeria, Abuja, Nigeria
5. Department of Public and Environmental Health, School of Medicine and Allied Health Sciences, University of The Gambia, Kanifing, Gambia
6. Department of Epidemiology, College of Public Health and Health Professions, University of Florida, Gainesville, FL, USA