PT - JOURNAL ARTICLE ED - , TI - Correction AID - 10.1503/cmaj.050770 DP - 2005 Jul 19 TA - Canadian Medical Association Journal PG - 133--133-b VI - 173 IP - 2 4099 - http://www.cmaj.ca/content/173/2/133.3.short 4100 - http://www.cmaj.ca/content/173/2/133.3.full SO - CMAJ2005 Jul 19; 173