Yongyukantorn, Kanlayanee, and Maliwan Oofuvong. “Risk Factors of Intraoperative and 24-Hour Postoperative Cardiac Arrest in Geriatric Patients in Non-Cardiac Surgery”. JOURNAL OF GERONTOLOGY AND GERIATRICS (July 15, 2020). Accessed September 29, 2020. http://www.jgerontology-geriatrics.com/article/view/237.