1. a Makerere University, Faculty of Medicine, Department of Paediatrics and Child Health , P. O Box 7062, Kampala , Uganda
2. b Department of Clinical Sciences , Institute of Tropical Medicine , Antwerp , Belgium
3. c Paediatric Infectious Disease Clinic/Baylor College of Medicine Children's Foundation-Uganda , Mulago Hospital , Kampala , Uganda
4. d University of Antwerp , Antwerp , Belgium