1. Department of Parasitology and Medical Entomology, Muhimbili University of Health and Applied Science, P.O. Box 65011, Dar es Salaam, Tanzania
2. Department of Internal Medicine, Muhimbili University of Health and Applied Science, P.O. Box 65001, Dar es Salaam, Tanzania
3. Directorate of Library Service, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
4. Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy