Sombood, P., K. Yangan, and P. Vichitvejpaisal. “Perioperative Cognition in the Elderly: A Matter not to be Overlooked”. Thai Journal of Anesthesiology, vol. 47, no. 3, May 2021, pp. 280-6, https://he02.tci-thaijo.org/index.php/anesthai/article/view/250936.