วรรณประไพ เ. (2016). Evaluation of oral health promotion services for children under 3 years old in Phayakkhaphum Phisai district, Mahasarakham province. Thai Dental Public Health Journal, 21(2), 13–19. retrieved from https://he02.tci-thaijo.org/index.php/ThDPHJo/article/view/149200