N. Christophe, University of Rwanda, College of Medicine and Health Sciences, School of Public Health
B. Gaspard, University of Rwanda, College of Medicine and Health Sciences, School of Public Health
M. Léonce, University of Rwanda, College of Medicine and Health Sciences, School of Public Health
U. Sandrine, Ministry of Health, Rwanda Biomedical Centre
R. Edward, Ministry of Health, Rwanda Biomedical Centre 