Do different analgesic methods affect preoperative anxiety, postoperative pain, and delirium in elderly patients undergoing gastrointestinal cancer surgery?
hiCTR2000032008, 17/04/2020, Title: "Effects of different analgesic methods on postoperative recovery of elderly patients with digestive tract tumor". Website: https://www.chictr.ogr.cn .
Liu et al. (Mon,) studied this question.
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