Tritrakarn, S.- on, N. Arlaipol, J. Lumyongsatien, and S. Wonglaksanapimon. “Is Non-Contrast Enhanced CT of Paranasal Sinus Adequate for the Diagnosis of Complicated Sinusitis?”. Siriraj Medical Journal, vol. 70, no. 1, Mar. 2018, pp. 53-59, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/114903.