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Effect of preemptive analgesia on postoperative cognitive dysfunction in general anesthesia patients undergoing abdominal surgery
XIANG Mingfang, YANG Han, ZHANG Lizi, LIU Zhiheng, YANG Xinping
Lingnan Modern Clinics in Surgery . 2017, (04): 394 -399 .  DOI: 10.3969/j.issn.1009-976X.2017.04.004