1. Department of Epidemiology and Medical Statistics, Faculty of Public Health, College of Medicine, University of Ibadan, Ibadan 200284, Nigeria
2. Department of Public Health Sciences, College of Medical Sciences, Rivers State University, Port Harcourt 500101, Nigeria
3. Department of Community Medicine, College of Medical Sciences, Rivers State University, Port Harcourt 500101, Nigeria
4. Department of Economics, Faculty of Social Sciences, National Open University of Nigeria, Abuja 900107, Nigeria
5. Department of Public & Environmental Health, School of Medicine & Allied Health Sciences, University of The Gambia, Kanifing 3530, The Gambia
6. Department of Epidemiology, College of Public Health and Health Professions, University of Florida, Gainesville, FL 32610, USA
7. Department of Public Health, Center of Excellence in Reproductive Health Innovation (CERHI), College of Medical Sciences, University of Benin, Benin City 300001, Nigeria
8. Department of Medical Biochemistry, School of Basic Medical Sciences, University of Benin, Benin City 300001, Nigeria