1. Department of Sociology, School of Public Administration, Hohai University, Nanjing, China
2. Department of Demography and Social Statistics, Faculty of Social Science, Obafemi Awolowo University, Ile-Ife, Nigeria
3. Organization of African Academic Doctor (OAAD), Nairobi, Kenya
4. Key Laboratory of Environmental Medicine Engineering, Ministry of Education, Department of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, Jiangsu Province, China
5. Biomedical Research Institute, Darfur College, Nyala, Sudan
6. Institute for Peace and Strategic Studies, University of Ibadan, Ibadan, Nigeria
7. Faculty of Humanities, North-West University, Mafikeng, South Africa
8. Public Health, Hamburg University of Applied Sciences, Hamburg, Germany
9. Department of Demography, College for Health, Community and Policy, The University of Texas at San Antonio, San Antonio, TX, USA
10. Department of Medical Microbiology, Faculty of Medical Laboratory Sciences, University of Khartoum, Khartoum, Sudan