Association Between Postoperative Long-Term Heart Rate Variability and Postoperative Delirium in Elderly Patients Undergoing Orthopedic Surgery: A Prospective Cohort Study by Jiaduo Sun, Qingguo Zhang, Baojia Lin, Mengjiao He, Yimin Pang, Qibo Liang, Zhibin Huang, Ping Xu, Dongdong Que, Shiyuan Xu

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