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Takayuki Toyonaga, Hiromitsu Matsuda, Ryuichi Mibu, Yohei Tominaga, Manabu Yamamoto, Tomonobu Gion, Yoshihiro Yoshida. "Perianal Endometriosis: Five Case Reports." Nippon Daicho Komonbyo Gakkai Zasshi 71.5 (2018) 228-234