PT - JOURNAL ARTICLE AU - Pierre La Rochelle TI - Basic learning concepts in <em>EBM</em>: the bidimentional hierarchy of evidence AID - 10.1136/eb-2013-101610 DP - 2013 Nov 26 TA - Evidence Based Medicine PG - ebmed-2013-101610 4099 - http://ebm.bmj.com/content/early/2013/11/26/eb-2013-101610.short 4100 - http://ebm.bmj.com/content/early/2013/11/26/eb-2013-101610.full