RT Journal Article SR Electronic T1 Epigastric discomfort after outpatient endoscopy JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1260 OP 1260 DO 10.1136/gut.2007.147967 VO 57 IS 9 A1 L Kamper A1 P Haage YR 2008 UL http://gut.bmj.com/content/57/9/1260.abstract AB