Corrigendum: A Novel Invadopodia-Specific Marker for Invasive and Pro-Metastatic Cancer Stem Cells - Huang, Shenq-Shyang; Liao, Wen-Ying; Hsu, Chung-Chi; Chan, Tze-Sian; Liao, Tai-Yan; Yang, Pei-Ming; Chen, Li-Tzong; Sung, Shian-Ying; Tsai, Kelvin K. (Frontiers in Oncology, 2021)