Correction: Cancer-associated fibroblast-derived SDF-1 induces epithelial-mesenchymal transition of lung adenocarcinoma via CXCR4/β-catenin/PPARδ signalling - Yingyan Wang; Wen Lan; Mingxin Xu; Jing Song; Jun Mao; Chunyan Li; Xiaohui Du; Yunling Jiang; Encheng Li; Rui Zhang; Qi Wang (Cell Death and Disease)