Likkasitipun, T., and S. Chindavijak. “Factors of Delayed Diagnosis of Oral Cancer in Rajavithi Supertertiary Care Hospital”. Journal of The Department of Medical Services, vol. 45, no. 1, Mar. 2020, pp. 104-10, https://he02.tci-thaijo.org/index.php/JDMS/article/view/244769.