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Median effective plasma concentration of propofol inhibiting body movement when combined with butorphanol in patients undergoing hysteroscopic surgery 
YANG Qinyan, HUANG Li, SHI Lan, OU Yuanyuan, LI Guoyuan, HUANG Chengyong
Chinese Journal of Clinical Pharmacology and Therapeutics . 2020, (9): 1033 -1037 .  DOI: 10.12092/j.issn.1009-2501.2020.09.011