Risk factors for nasal bleeding in patients undergoing transnasal gastrointestinal endoscopy by Mitsuyo Mieda, Hiroshi Miyashita, Hiroyuki Osawa, Tomosuke Hirasawa, Nobuko Makino, Sachiko Toma, Takeshi Tomiyama, Yoshimasa Miura, Alan K. Lefor, Hironori Yamamoto

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