RT Journal Article SR Electronic T1 Additional Articles Abstracted in ACP Journal Club JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 131 OP 131 DO 10.1136/ebm.1997.2.131 VO 2 IS 5 YR 1997 UL http://ebm.bmj.com/content/2/5/131.abstract AB