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Citation
Mai CM, Wan LT, Chou YC, Yang HY, Wu CC, Jao SW, Hsiao CW. Efficacy and safety of transnasal butorphanol for pain relief after anal surgery. World J Gastroenterol 2009; 15(38): 4829-4832 [PMID: 19824119 DOI: 10.3748/wjg.15.4829]
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