RT Journal Article SR Electronic T1 Controlled and extended release metoprolol reduced death, hospital admissions, and symptoms in chronic heart failure JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 142 OP 142 DO 10.1136/ebm.5.5.142 VO 5 IS 5 YR 2000 UL http://ebm.bmj.com/content/5/5/142.abstract AB