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Effects of intravenous patient-controlled analgesia with buprenorphine and morphine alone and in combination during the first 12 postoperative hours: A randomized, double-blind, four-arm trial in adults undergoing abdominal surgery

Intravenous Patient-controlled AnalgesiaHealth SciencesFirst 12Pain MedicineMedicinePostoperative Pain ManagementFour-arm TrialPreoperative PainPain ManagementSurgeryAnesthesiaPerioperative MedicineAnalgesicsAnesthesiologyRegional Anesthesia