Hsiung, Anakkawee, Saowanee Kitudomrat, and Paranat Yiampop. “Efficacy of Local Infiltration Tramadol (transversus Abdominis Plane Block Technique) Versus Preemptive Intravenous Tramadol on Postoperative Pain After Open Appendectomy: A Prospective Randomized Controlled Trial”. International Surgery Journal 12, no. 5 (April 25, 2025): 706–712. Accessed February 20, 2026. https://www.ijsurgery.com/index.php/isj/article/view/11046.