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source: https://www.researchgate.net/publication/230714773_High-frequency_electroacupuncture_versus_carprofen_in_an_incisional_pain_model_in_rats/fulltext/0301dc580cf2d22ff276656a/High-frequency-electroacupuncture-versus-carprofen-in-an-incisional-pain-model-in-rats.pdf