RT Journal Article SR Electronic T1 Basic learning concepts in EBM: the bidimentional hierarchy of evidence JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP ebmed-2013-101610 DO 10.1136/eb-2013-101610 A1 Pierre La Rochelle YR 2013 UL http://ebm.bmj.com/content/early/2013/11/26/eb-2013-101610.abstract AB