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Effect of Hydromorphone Hydrochloride combined with Ropivacaine brachial plexus block anesthesia on postoperative analgesia of upper limb fractures#br#
CHEN Yanmei   QIAN Cheng▲
Department of Anesthesiology, Changzhou Medical District, 904th Hospital of the Joint Logistic Support Force of the Chinese People’s Liberation Army, Jiangsu Province, Changzhou   213000, China
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