Correction: Baicalin-modifed polyethylenimine for miR-34a efficient and safe delivery - Yingying Wang; Yingying Wang; Baiyan Wang; Yangfan Xiao; Qingchun Cai; Junyue Xing; Hao Tang; Ruiqin Li; Hongtao Zhang; Hongtao Zhang; Hongtao Zhang; Hongtao Zhang (Frontiers in Bioengineering and Biotechnology)