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Multiple effects of morphine on facial scratching in monkeys.
Thomas DA, Williams GM, Iwata K, Kenshalo DR Jr, Dubner R. Thomas DA, et al. Among authors: kenshalo dr jr. Anesth Analg. 1993 Nov;77(5):933-5. doi: 10.1213/00000539-199311000-00010. Anesth Analg. 1993. PMID: 8214729
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