PHONGVIVAT, PHONGRAPEE. “The Result of Local Twitch Response During Treatment of Myofascial Pain Syndrome in the Upper Trapezius Muscle by Trigger Point Injection Technique: A Retrospective Study”. Region 11 Medical Journal 35, no. 2 (November 1, 2021). Accessed May 4, 2024. https://he02.tci-thaijo.org/index.php/Reg11MedJ/article/view/250011.