等效剂量曲马朵、吗啡、芬太尼用于老年人术后硬膜外自控镇痛的临床观察
등효제량곡마타、마배、분태니용우노년인술후경막외자공진통적림상관찰
Clinical evaluation of eqivalent dose of Tramadol, Morphine, Fentanyl for patient-controlled epidural analgesia after surgery in the elderly patients
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