Vijitpavan, A., N. Ruananukun, and P. Chaiboon. “Videolaryngoscope Compared to Direct Laryngoscope for Nasogastric Placement”. Thai Journal of Anesthesiology, vol. 41, no. 3, June 2016, pp. 141-2, https://he02.tci-thaijo.org/index.php/anesthai/article/view/58689.