Pulsawat, Pichanun, and Pattamaporn Khemphet. “Low and High Doses of Caudal Morphine on Quality of Postoperative Analgesia and Morphine-Related Side Effects in Pediatric Urethroplasty: a Randomized Controlled Trial”. Thai Journal of Anesthesiology 51, no. 5 (August 27, 2025): 319–328. accessed September 20, 2026. https://he02.tci-thaijo.org/index.php/anesthai/article/view/277306.