老年患者腹腔镜直肠癌术后硬膜外麻醉与静脉自控镇痛的效果及对血气的影响
노년환자복강경직장암술후경막외마취여정맥자공진통적효과급대혈기적영향
Effects of patient controlled epidural analgesia and patient controlled intravenous analgesia on analgesic result and blood gas in aged patients undergoing laparoscopic rectectomy
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