Luengrojjanakul, P., P. Tripuwabhrut, P. Kongtewelert, S. Ongchai, and D. Jotikasthira. “Comparisons of the Chondroitin Sulphate Levels and the Amount of Pain During Initial Orthodontic Leveling Phase Between Passive Self-Ligating and Conventional Bracket Systems”. Thai Journal of Orthodontics, vol. 9, no. 2, Sept. 2020, pp. 4-14, https://he01.tci-thaijo.org/index.php/THAIORTHO/article/view/249531.