1. Department of Biological Sciences, University of Zambia, Lusaka, Zambia.
2. Department of Disease Control, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom.
3. Department of Public Health, University of Zambia School of Medicine, Lusaka, Zambia.
4. Department of Clinical Sciences, Tropical Diseases Research Centre, Ndola, Zambia.
5. Department of Obstetrics and Gynaecology, University of Zambia School of Medicine, Lusaka, Zambia.
6. Department of Paediatrics and Child Health, University of Zambia School of Medicine, Lusaka, Zambia.
7. Department of Medical Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.
8. Faculty of Health Sciences, Africa University, Mutare, Zimbabwe.