[1] Usmanu Danfodiyo Univ Teaching Hosp, Dept Pharm, Sokoto, Nigeria
[2] Cephas Hlth Res Initiat Inc, Ibadan, Nigeria
[3] Usmanu Danfodiyo Univ Teaching Hosp, Community Hlth Officers Training Programme, Sokoto, Nigeria
[4] Obafemi Awolowo Univ Teaching Hosp, Dept Internal Med, Ife, Nigeria