RT Journal Article SR Electronic T1 Evidently… JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 103 OP 103 DO 10.1136/ebm.13.4.103 VO 13 IS 4 A1 Lehman, Richard YR 2008 UL http://ebm.bmj.com/content/13/4/103.abstract AB