PT - JOURNAL ARTICLE AU - Geoffrey Norman, PhD TI - Problem-based learning makes a difference. But why? AID - 10.1503/cmaj.071590 DP - 2008 Jan 01 TA - Canadian Medical Association Journal PG - 61--62 VI - 178 IP - 1 4099 - http://www.cmaj.ca/content/178/1/61.short 4100 - http://www.cmaj.ca/content/178/1/61.full SO - CMAJ2008 Jan 01; 178