Ruangsawasdi, N., and J. Kaewprag. “Regenerative Endodontic: Cell-Based Versus Cell-Free Approach”. Mahidol Dental Journal, vol. 38, no. 3, Oct. 2018, pp. 313-20, https://he02.tci-thaijo.org/index.php/mdentjournal/article/view/132348.