Bunmee, U. “The study of Right ventricular longitudinal strain by Echocardiography in child and adolescents under 19 years old”. Journal of Medical and Public Health Region 4, vol. 15, no. 2, July 2025, pp. 68-77, https://he01.tci-thaijo.org/index.php/JMPH4/article/view/266589.