1. School of Medicine, College of Health Sciences, Makerere University, Kampala, Uganda
2. School of Health Sciences, College of Health Sciences, Makerere University, Kampala, Uganda
3. Department of Medical Microbiology and Immunology, Faculty of Medicine, Gulu University, Gulu, Uganda
4. Department of Paediatrics & Child Health, School of Medicine, College of Health Sciences, Makerere University, Kampala, Uganda