Chinachot, T., P. Turasakul, C. Wachjanawach, and N. Sooksri. “Incidence, severity and factors lead to abnormal pre-operative blood chemistry, CBC, Chest X-ray and EKG in routine preoperative investigation”. Thai Journal of Anesthesiology, vol. 42, no. 2, June 2016, pp. 69-87, https://he02.tci-thaijo.org/index.php/anesthai/article/view/61106.