Effects of hydromorphone-based patient-controlled intravenous analgesia on postoperative hypoxaemia: a randomised controlled non-inferiority clinical trial by Xuan Yang, Ziyu Zheng, Yumei Ma, Zhuomin Deng, Xiangying Feng, Jialin Luo, Yang Meng, Jingjing Lin, Xiaoxiao Mu, Huang Nie, Hailong Dong, Nong Yan, Jiejuan Du

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