1. National Malaria Control Centre, Ministry of Health, P.O. Box 32509, Lusaka, Zambia
2. Ministry of Health, Headquarters, Ndeke House., P.O. Box 30205, Lusaka, Zambia
3. Malaria Research Programme, Medical Research Council, Ridge Road, Durban, South Africa
4. School of Medicine, University of Zambia, P.O. Box 50110, Lusaka, Zambia