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Yo I, Chung JW, Jeong MH, Lee JJ, An J, Kwon KA, Rim MY, Hahm KB.Yo I, et al. Among authors: hahm kb.Clin Endosc. 2013 May;46(3):297-300. doi: 10.5946/ce.2013.46.3.297. Epub 2013 May 31.Clin Endosc. 2013.PMID: 23767044Free PMC article.