One-carbon metabolism and CpG island methylator phenotype status in incident colorectal cancer: a nested case–referent study - Bethany Van Guelpen; Anna M. Dahlin; Johan Hultdin; Vincy Eklöf; Ingegerd Johansson; Maria L. Henriksson; Inger Cullman; Göran Hallmans; Richard Palmqvist (Cancer Causes & Control, 2010)