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El-Sayed R, Fahmy M, El Koofy N, El-Raziky M, El-Hawary M, Helmy H, El-Akel W, El-Hennawy A, El-Karaksy H.El-Sayed R, et al.Trop Gastroenterol. 2011 Oct-Dec;32(4):267-72.Trop Gastroenterol. 2011.PMID: 22696906