RT Journal Article SR Electronic T1 Carvedilol was more effective than metoprolol for preventing cardiovascular events in heart failure JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 141 OP 141 DO 10.1136/ebm.12.5.141 VO 12 IS 5 YR 2007 UL http://ebm.bmj.com/content/12/5/141.abstract AB