Affiliation: | 1.Department of Community Health, College of Health Sciences, Obafemi Awolowo University, Ile-Ife, Nigeria ;2.Department of Chemical Pathology, College of Health Sciences, Obafemi Awolowo University, Ile-Ife, Nigeria ;3.Depatment of E.N.T., Ladoke Akintola University Teaching Hospital, Osogbo, Nigeria ;4.Department of Geology, Obafemi Awolowo University, Ile-Ife, Nigeria ; |