Comparative efficacy and safety of nalbuphine and hydromorphone in painless colonoscopy techniques: a randomized controlled trial by Chunliu Hou, Siming Zhang, Yuqing Zhu, Guochun Wen, Guoran Wang, Jinxiang Dai, Fei Xu, Chunjie Li, Huiyi Chen, Di Wang, Qingqing Han, Xuesen Su, Wenjie Zhang, Shouyuan Tian, Yan Li

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