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Ryu DY, Cheong JH, Lee DG, Lee BE, Kim DU, Kim GH, Song GA.Ryu DY, et al. Among authors: cheong jh.Korean J Gastroenterol. 2010 Sep;56(3):205-8. doi: 10.4166/kjg.2010.56.3.205.Korean J Gastroenterol. 2010.PMID: 20847612Free article.Korean.
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