Corrigendum: Comparison of clinical outcomes between cone beam CT-guided thermal ablation and helical tomotherapy in pulmonary metastases from hepatocellular carcinoma - Wang, Feihang; Fan, Shaonan; Shi, Qin; Zhao, Danyang; Sun, Huiyi; Sothea, Yav; Wu, Mengfei; Song, Huadan; Chen, Yi; Cheng, Jiemin; Zeng, Zhaochong; Yan, Zhiping; et al. (Frontiers in Oncology, 2022)