Effectiveness of endoscopic submucosal dissection in the management of internal hemorrhoids: a retrospective cohort study by Hidenori Tanaka, Toshio Kuwai, Shinji Nagata, Naoki Asayama, Yuko Hiraga, Tomohiko Kohno, Yuzuru Tamaru, Masaki Kunihiro, Koki Nakamura, Ken Yamashita, Yoshihiro Kishida, Shiro Oka

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