Effect of Dexmedetomidine with Ulinastatin on Perioperative Neurocognitive Disorders in Elderly Patients Undergoing Laparoscopic Surgery for Colorectal Cancer——a Multicenter，Randomized，Double-blind，Controlled Study　
GUO Zongfeng，WANG Xiang，CAO Su，XU Xingguo，ZHANG Changwei，YU Xiaoyan，XU Weidong
Chinese General Practice . 2020, (36): 4578 -4584 .  DOI: 10.12114/j.issn.1007-9572.2020.00.553

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