RT Journal Article SR Electronic T1 Meta-analysis: Prophylaxis with anti-ulcer therapy reduces clinically important GI bleeding in critically ill patients JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 143 OP 143 DO 10.1136/ebm.1996.1.143 VO 1 IS 5 YR 1996 UL http://ebm.bmj.com/content/1/5/143.abstract AB