Nattarangsi W, Intrarak T. 2020. “Pain Reduction in Rigid Nasendoscopy Between 1% Lidocaine With Oxymetazoline and 2% Lidocaine With Oxymetazoline: A Double-Blind Randomized Controlled Trial”. Journal of The Department of Medical Services 45 (2):91-97. https://he02.tci-thaijo.org/index.php/JDMS/article/view/245500.