Affiliation: | 1. Department of Epidemiology and Medical Statistics, College of Medicine, University of Ibadan, Ibadan, Nigeria 2. Department of Physiology, University College Hospital, Ibadan, Nigeria 3. Department of Public Health, Oyo State Teaching Service Commission, Ibadan, Nigeria 5. Research Assistant, Oyo State Teaching Service Commission, Ibadan, Nigeria 4. Department of Otorhinolaryngology, Faculty of Clinical Sciences, College of Medicine, University of Ibadan, PO Box 22040, Ibadan, Nigeria
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