1. Department of Epidemiology and Biostatistics, College of Medicine and Health Sciences, University of Gondar , Gondar , Ethiopia
2. Department of Biostatistics and Epidemiology, School of Public Health and Health Sciences, University of Massachusetts , Amherst, MA , USA
3. Institute of Policy Studies and School of Graduate Studies, Lingnan University , Tuen Mun , Hong Kong
4. L & E Research Consult Ltd , Wa, Upper West Region , Ghana
5. University of Parakou, Faculty of Medicine , Parakou , Benin
6. School of International Development and Global Studies, University of Ottawa , Ottawa, Ontario , Canada
7. George Institute for Global Health, Imperial College London , London , UK