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Efficacy of Intraoperative Subanaesthetic Dose of Ketamine on Post-Operative Analgesia for Patients Undergoing Single Level Lumbar Discectomy under General Anesthesia: A Placebo Control Randomized Clinical Study. Asian J Med Sci 2023, 14 (11), 53-59. https://doi.org/10.3126/ajms.v14i11.56489.