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Al-Jiffri O, Al-Sharif FM, Abd El-Kader SM, Ashmawy EM.Al-Jiffri O, et al. Among authors: al sharif fm.Afr Health Sci. 2013 Sep;13(3):667-72. doi: 10.4314/ahs.v13i3.21.Afr Health Sci. 2013.PMID: 24250305Free PMC article.Clinical Trial.