老年骨科患者应用小剂量罗哌卡因腰-硬联合麻醉手术的临床路径
노년골과환자응용소제량라고잡인요-경연합마취수술적림상로경
The small dose of ropivacaine and bupivacaine for combined spinal-e pidural anesthesia in elderly orthopedics patients
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