RT Journal Article SR Electronic T1 Disorders of a modern lifestyle: reconciling the epidemiology of inflammatory bowel diseases JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1185 OP 1191 DO 10.1136/gut.2007.122143 VO 57 IS 9 A1 Charles N Bernstein A1 Fergus Shanahan YR 2008 UL http://gut.bmj.com/content/57/9/1185.abstract AB