Harnphadungkit, Kamontip, Pravit Akarasereenont, Pranee Chadvongvan, and Chayaporn Chotiyarnwong. 2018. “Efficacy of 0.0125% Capsaicin Patch at Acupuncture Point for Pain Relief in Knee Osteoarthritis: A Randomized Controlled Trial”. Siriraj Medical Journal 70 (5):382-90. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/152638.