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 September 19, 2026. https://he02.tci-thaijo.org/index.php/Reg11MedJ/article/view/250011.