RT Journal Article SR Electronic T1 Occult gastrointestinal bleeding: two eyes are better than one JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP gutjnl-2018-318095 DO 10.1136/gutjnl-2018-318095 A1 Samuel Pannick A1 Katherine van Ree A1 Patrizia Cohen A1 Geoff Smith A1 John Martin YR 2019 UL http://gut.bmj.com/content/early/2019/02/01/gutjnl-2018-318095.abstract AB