医学临床研究
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JOURNAL OF CLINICAL RESEARCH  2018, Vol. 35 Issue (9): 1669-1671    DOI: 10.3969/j.issn.1671-7171.2018.09.002
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Effect of Hydromorphone on Patient-Controlled Analgesia after Knee Arthroplasty in Elderly Patients
HAN Rui
Departnent of Anesthesiology, the Gui Zhou Orthopedics Hospital,Gui Yang 550004 China
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