Gluteal-fold flap repair of rectovaginal fistula caused by aluminum potassium sulfate hydrate-tannic acid injection for internal hemorrhoids: a case report by Masanori Yoshimitsu, Hiroyuki Egi, Shogo Nagamatsu, Manabu Shimomura, Keishi Hakoda, Masashi Miguchi, Toshihiko Kohashi, Masazumi Okajima, Hideki Ohdan

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