Necessity of pharyngeal anesthesia during transoral gastrointestinal endoscopy: a randomized clinical trial by Tomoyuki Hayashi, Yoshiro Asahina, Yasuhito Takeda, Masaki Miyazawa, Hajime Takatori, Hidenori Kido, Jun Seishima, Noriho Iida, Kazuya Kitamura, Takeshi Terashima, Sakae Miyagi, Tadashi Toyama, Eishiro Mizukoshi, Taro Yamashita

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