1. Department of Pediatrics, University of Nigeria/University of Nigeria Teaching Hospital, Ituku Ozalla Enugu
2. Child Survival Unit, Medical Research Council UK, The Gambia Unit, Gambia
3. Department of Pediatrics, Faculty of Medicine, Nnamdi Azikiwe University, Nnewi campus, Anambra State, Nigeria
4. Department of Microbiology, University of Nigeria/University of Nigeria Teaching Hospital, Ituku Ozalla Enugu
5. Department of Pediatrics, Alex Ekwueme University Teaching Hospital, Abakiliki, Ebonyi State Nigeria