Erratum: Downregulation of uPAR and Cathepsin B Induces Apoptosis via Regulation of Bcl-2 and Bax and Inhibition of the PI3K/Akt Pathway in Gliomas (PLoS ONE (2014) 9:1 (DOI:10.1371/annotation/bb2f92ec-2ac1-4952-b744- 0519aeb10d1c))