Sukantarat, Numphung, and Kanokwan Uthaiwan. 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):157-66. https://he02.tci-thaijo.org/index.php/anesthai/article/view/275222.