Safety and efficacy of intravenous hydromorphone patient-controlled analgesia versus intramuscular pethidine in acute pancreatitis: An open-label, randomized controlled trial by Zhiyao Chen, Kun Jiang, Fei Liu, Ping Zhu, Fei Cai, Yanqiu He, Tao Jin, Ziqi Lin, Qian Li, Cheng Hu, Qingyuan Tan, Xiaonan Yang, Jia Guo, Wei Huang, Lihui Deng, Qing Xia

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