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Song JH, Park YH, Seo SH, Lee A, Kim KH, An MS, Bae KB, Hong KH, Hwang JW, Kim JH, Jung HS, Ahn KJ.Song JH, et al. Among authors: ahn kj.Ann Coloproctol. 2017 Dec;33(6):219-226. doi: 10.3393/ac.2017.33.6.219. Epub 2017 Dec 31.Ann Coloproctol. 2017.PMID: 29354604Free PMC article.