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Aho AJ, Yli-Hankala A, Lyytikäinen L-, Jäntti V. Facial muscle activity, Response Entropy, and State Entropy indices during noxious stimuli in propofol–nitrous oxide or propofol–nitrous oxide–remifentanil anaesthesia without neuromuscular block. British Journal of Anaesthesia. 2009 Feb;102(2):227–33. doi: 10.1093/bja/aen356. |