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Effect Of Ultrasound Guided Superficial Cervical Plexus Block Using Combination Of Bupivacaine And Lidocaine On Intraoperative Opioid Consumption In Tympanomastoid Operations In Adults, Randomized Controlled Study. Journal of Pharmaceutical Negative Results 2023, 326-332. https://doi.org/10.47750/pnr.2023.14.02.42.