RT Journal Article SR Electronic T1 Epigenetic changes wipe out protective mechanisms in Barrett’s oesophagus JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1 OP 2 DO 10.1136/gut.2008.162446 VO 58 IS 1 A1 Rebecca C Fitzgerald YR 2009 UL http://gut.bmj.com/content/58/1/1.abstract AB