Sangariyavanich, E., T. Imsuwansri, and A. Thaiyakul. “Cost-Effectiveness Analysis of Esophageal Cancer Screening in Patients With Hypopharyngeal Cancer Using Transnasal Esophagoscopy Compared With Rigid Esophagoscopy”. Journal of The Department of Medical Services, vol. 45, no. 4, Mar. 2021, pp. 17-23, https://he02.tci-thaijo.org/index.php/JDMS/article/view/249732.