A. C. C. Wong, Y. C. Mun, M. S. Suondoh, and S. A. Yeap, “Adult Presentation of Congenital Midline Upper Lip Sinus”, IJRAMT, vol. 6, no. 1, pp. 11–13, Jan. 2025, Accessed: Apr. 24, 2025. [Online]. Available: https://journals.ijramt.com/index.php/ijramt/article/view/3004