TY - JOUR T1 - Problem-based learning makes a difference. But why? JF - Canadian Medical Association Journal JO - CMAJ SP - 61 LP - 62 DO - 10.1503/cmaj.071590 VL - 178 IS - 1 AU - Geoffrey Norman, PhD Y1 - 2008/01/01 UR - http://www.cmaj.ca/content/178/1/61.abstract ER -