RT Journal Article SR Electronic T1 Reversal of DNA hypomethylation by folic acid supplements: possible role in colorectal cancer prevention JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 579 OP 581 DO 10.1136/gut.2004.059881 VO 54 IS 5 A1 J C Mathers YR 2005 UL http://gut.bmj.com/content/54/5/579.abstract AB