K. Harnphadungkit, P. Akarasereenont, P. Chadvongvan, and C. Chotiyarnwong, “Efficacy of 0.0125% Capsaicin Patch at Acupuncture Point for Pain Relief in Knee Osteoarthritis: A Randomized Controlled Trial”, Siriraj Med J, vol. 70, no. 5, pp. 382–390, Oct. 2018.