1. Archbishop Anthony Mayala School of Nursing, Catholic University of Health and Allied Sciences, Mwanza P.O. Box 1464, Tanzania
2. Department of Microbiology and Immunology, Weill Bugando School of Medicine, Catholic University of Health and Allied Sciences, Mwanza P.O. Box 1464, Tanzania
3. Department of Biochemistry and Molecular Biology, Weill Bugando School of Medicine, Catholic University of Health and Allied Sciences, Mwanza P.O. Box 1464, Tanzania
4. Department of Biostatistics, Epidemiology and Behavioral Sciences, Weill Bugando School of Medicine, Catholic University of Health and Allied Sciences, Mwanza P.O. Box 1464, Tanzania