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Arya S, Varley P, Youk A, et al. Recalibration and external validation of the Risk Analysis Index: a surgical frailty assessment tool. Ann Surg. 2020;272(6):996–1005. doi:10.1097/SLA.0000000000003276

Shinall MC Jr, Arya S, Youk A, et al. Association of preoperative patient frailty and operative stress with postoperative mortality. JAMA Surg. 2020;155(1):e194620. doi:10.1001/jamasurg.2019.4620 (Tables 2 and 3)