Corrigendum: Doxycycline Inhibits Cancer Stem Cell-Like Properties via PAR1/FAK/PI3K/AKT Pathway in Pancreatic Cancer - Liu, Huijuan; Tao, Honglian; Wang, Hongqi; Yang, Yuyan; Yang, Ru; Dai, Xintong; Ding, Xiujuan; Wu, Haidong; Chen, Shuang; Sun, Tao (Frontiers in Oncology, 2022)