老年患者行全髋关节置换术后硬脊膜外腔镇痛舒芬太尼最适质量浓度的研究
노년환자행전관관절치환술후경척막외강진통서분태니최괄질량농도적연구
Optimal mass concentration of sufentanil for patient controlled epidural analgesia after hip replacement in the aged
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