Corrigendum: Oroxylin a Inhibits the Protection of Bone Marrow Microenvironment on CML Cells Through CXCL12/CXCR4/P-gp Signaling Pathway - Cao, Hanbo; Li, Wenjun; Zhou, Yizhou; Tan, Renxiang; Yang, Yue; Zhou, You; Guo, Qinglong; Zhao, Li (Frontiers in Oncology, 2019)