Yuan W, Chen J, Shu Y, Liu S, Wu L, Ji J, Liu Z, Tang Q, Zhou Z, Cheng Y, Jiang B, Shu X. Correlation of DAPK1 methylation and the risk of gastrointestinal cancer: A systematic review and meta-analysis. PLoS ONE. 2017 Sep 21;12(9):e0184959. doi: 10.1371/journal.pone.0184959.