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.12.4.103 VO 12 IS 4 A1 Richard Lehman YR 2007 UL http://ebm.bmj.com/content/12/4/103.abstract AB