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Rural Health Unit, Department of Family Medicine, University of Calabar Teaching Hospital, Calabar, Nigeria. 2. Department of Community Medicine, University of Calabar Teaching Hospital, Calabar, Nigeria 3. Department of Pathology, University of Calabar, Calabar, Nigeria Correspondence to: Dr. N. E. Udonwa Rural Health Unit, Department of Family Medicine University of Calabar Teaching Hospital GPO Box 147, Calabar, Nigeria e-mail: nudonwa@yahoo.com
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Udonwa et al. (2009) studied this question.
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