1. School of Health Sciences, College of Medicine and Health Sciences, University of Rwanda, Kigali, Rwanda
2. School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Braamfontein, South Africa
3. Department of Biomedical Statistics and Informatics, Vrije Universiteit Brussel, Brussels, Belgium
4. Nigerian Institute of Medical Research, Lagos, Yaba, Nigeria