Phumkarn, T., and S. Wessayasatit. “Factors Associated With the Success of Initial Non-Surgical Root Canal Treatment Performed by Dental Postgraduates”. Journal of The Department of Medical Services, vol. 47, no. 4, Dec. 2022, pp. 77-83, https://he02.tci-thaijo.org/index.php/JDMS/article/view/258163.