Boonyoung, N., Paungmali, A., & Pichaiya, T. (2015). The effect of self-stretching and PNF stretching on pressure pain threshold over the trigger point of upper trapezius muscle in women. Journal of Associated Medical Sciences, 39(3), 71. Retrieved from https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/60185