Correlation of preoperative frailty with postoperative delirium and one-year mortality in Chinese geriatric patients undergoing noncardiac surgery: Study protocol for a prospective observational cohort study. - Zhang, Min; Gao, Xiaojun; Liu, Mengjie; Gao, Zhongquan; Sun, Xiaxuan; Huang, Linlin; Zou, Ting; Guo, Yongle; Chen, Lina; Liu, Yang; Zhang, Xiaoning; Feng, Hai; et al. (PLoS ONE, 2024)