Lapying, P., P. Sang-la, P. Sontham, and V. Chaimuang. “Cost-Effectiveness of 12-Month Pit-Fissure Sealant on First Molars”. Journal of Health Science of Thailand, vol. 18, no. 6, Jan. 2018, pp. 826-35, https://thaidj.org/index.php/JHS/article/view/1864.