Chuenwattana, Wannara, Sitthiphon Bunman, and Jonghyun Kim. “Evaluation of Potential Skin Sensitization of Humans Receiving Proteoglycan Facial Mask”. The Bangkok Medical Journal 15, no. 1 (February 20, 2019): 7. Accessed August 14, 2020. https://he02.tci-thaijo.org/index.php/bkkmedj/article/view/222607.