Erratum to: Long non-coding RNA ANRIL is upregulated in hepatocellular carcinoma and regulates cell proliferation by epigenetic silencing of KLF2 oleh Ming-de Huang, Wen-ming Chen, Fu-zhen Qi, Rui Xia, Ming Sun, Tong-peng Xu, Li Yin, Er-bao Zhang, Wei De, Yong-qian Shu