RT Journal Article SR Electronic T1 Increased prevalence of methylenetetrahydrofolate reductase C677T variant in patients with IBD JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 456 OP 457 DO 10.1136/gut.47.3.456 VO 47 IS 3 A1 J N NIELSEN A1 T B LARSEN A1 L FREDHOLM A1 I BRANDSLUND A1 P MUNKHOLM A1 H HEY YR 2000 UL http://gut.bmj.com/content/47/3/456.abstract AB