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- [29] Analgesic Effect of Intraoperative Intravenous S-Ketamine in Opioid-Naive Patients After Major Lumbar Fusion Surgery Is Temporary and Not Dose-Dependent: A Randomized, Double-Blind, Placebo-Controlled Clinical Trial ANESTHESIA AND ANALGESIA, 2021, 132 (01): : 69 - 79