[1] Muhimbili Univ Hlth & Allied Sci, Dept Pharmaceut Microbiol, POB 65013, Dar es Salaam, Tanzania
[2] Muhimbili Univ Hlth & Allied Sci, Dept Behav Sci, POB 65001, Dar es Salaam, Tanzania
[3] Muhimbili Univ Hlth & Allied Sci, Dept Pharmacognosy, POB 65013, Dar es Salaam, Tanzania
[4] Muhimbili Univ Hlth & Allied Sci, Dept Biostat & Epidemiol, POB 65001, Dar es Salaam, Tanzania