RT Journal Article SR Electronic T1 Antibiotic prophylaxis in gastrointestinal endoscopy JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 869 OP 880 DO 10.1136/gut.2007.136580 VO 58 IS 6 A1 M C Allison A1 J A T Sandoe A1 R Tighe A1 I A Simpson A1 R J Hall A1 T S J Elliott YR 2009 UL http://gut.bmj.com/content/58/6/869.abstract AB