1. West African Center for Cell Biology of Infectious Pathogens, University of Ghana, P. O. Box LG54, Legon, Ghana
2. Department of Epidemiology, Noguchi Memorial Institute for Medical Research, College of Health Sciences, University of Ghana, P. O. Box LG581, Legon, Ghana
3. Centre for Tropical Clinical Pharmacology and Therapeutics, University of Ghana Medical School, P. O. Box GP4236, Accra, Ghana