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Ayi I, Edu SA, Apea-Kubi KA, Boamah D, Bosompem KM, Edoh D.Ayi I, et al.Ghana Med J. 2009 Sep;43(3):107-14. doi: 10.4314/gmj.v43i3.55325.Ghana Med J. 2009.PMID: 20126322Free PMC article.