Sukantarat, N. and Uthaiwan, K. 2025. Comparison of Postoperative Pain Scores between Intraoperative Intravenous Ketamine and Placebo in Patients Undergoing Unilateral Total Knee Arthroplasty under General Anesthesia: a Double-blind Randomized Controlled Trial. Thai Journal of Anesthesiology. 51, 3 (May 2025), 157–166.