不同剂量芬太尼混合甲磺酸罗哌卡因对下腹部手术病人硬膜外麻醉效果的影响
불동제량분태니혼합갑광산라고잡인대하복부수술병인경막외마취효과적영향
Epidural anesthesia with different dosage of fentanyl combined with ropivacaine mesylate for abdominal surgery
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