1. Department of Physiology, Morehouse School of Medicine, Atlanta, GA 30310, USA
2. Department of Pathology, Korle-Bu Teaching Hospital, University of Ghana Medical School, Accra P.O. Box 4236, Ghana
3. Department of Parasitology, Noguchi Memorial Institute for Medical Research, University of Ghana, Accra P.O. Box LG581, Ghana
4. Department of Haematology, Korle-Bu Teaching Hospital, Accra P.O. Box 77, Ghana
5. Department of Microbiology, Biochemistry and Immunology, Morehouse School of Medicine, Atlanta, GA 30310, USA