Corrigendum: A simplified frailty index and nomogram to predict the postoperative complications and survival in older patients with upper urinary tract urothelial carcinoma - Liu, Jianyong; Wang, Haoran; Wu, Pengjie; Wang, Jiawen; Wang, Jianye; Hou, Huimin; Wang, Jianlong; Zhang, Yaoguang (Frontiers in Oncology, 2025)