Corrigendum: Glucose-Regulated Protein 78 Signaling Regulates Hypoxia-Induced Epithelial–Mesenchymal Transition in A549 Cells - Sun, Ling-Ling; Chen, Chang-Ming; Zhang, Jue; Wang, Jing; Yang, Cai-Zhi; Lin, Li-Zhu (Frontiers in Oncology, 2020)