Corrigendum: PET/Ct Imaging of Activated Cancer-Associated Fibroblasts Predict Response to PD-1 Blockade in Gastric Cancer Patients - Rong, Xiaoxiang; Lv, Jinyu; Liu, Yantan; Wang, Zhaojun; Zeng, Dongqiang; Li, Yuedan; Li, Shaowei; Wu, Jianhua; Shen, Zheyu; Shi, Min; Liao, Wangjun; Wu, Zhenzhen; et al. (Frontiers in Oncology, 2022)