Kosallavat, Setthawut, Naphat Janpoom, Natthakarn Nakrungsri, Tipwadee Chaijunda, Tipanan Jitjak, Pongsek Somsook, Noppanat Tiansuwan, Naesinee Chaiear, Sirintip Boonjaraspinyo, and Darika Wortong. “The Proportion of Preoperative Patients Who Had an Anxiety: A Study in a University Hospital in Thailand”. Srinagarind Medical Journal 30, no. 5 (October 5, 2015): 92. Accessed May 20, 2022. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/40251.