RT Journal Article SR Electronic T1 Teaching tip: balloons and teddy bears JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 39 OP 39 DO 10.1136/ebm.11.2.39 VO 11 IS 2 A1 Gervase Vernon YR 2006 UL http://ebm.bmj.com/content/11/2/39.abstract AB