Correction: Absence of cyclin-dependent kinase inhibitor p27 or p18 increases efficiency of iPSC generation without induction of iPSC genomic instability - Zhiyan Zhan; Lili Song; Weiwei Zhang; Haihui Gu; Haizi Cheng; Yingwen Zhang; Yi Yang; Guangzhen Ji; Haizhong Feng; Tao Cheng; Yanxin Li (Cell Death and Disease)