小剂量吗啡伍用局麻药行椎管内麻醉对老年患者术后认知功能影响的观察
소제량마배오용국마약행추관내마취대노년환자술후인지공능영향적관찰
Treatment effects of intrathecal anesthesia combined small dose morphine on postoperative cognitive function in elderly patients
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