Comparison of sedation with pentazocine or pethidine hydrochloride for endoscopic ultrasonography in outpatients: A single‐center retrospective study by Makiko Urabe, Kenji Ikezawa, Yusuke Seiki, Ko Watsuji, Yasuharu Kawamoto, Takeru Hirao, Yugo Kai, Ryoji Takada, Takuo Yamai, Kaori Mukai, Tasuku Nakabori, Hiroyuki Uehara, Kazuyoshi Ohkawa

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