PT - JOURNAL ARTICLE ED - , TI - Corrections AID - 10.1503/cmaj.080883 DP - 2008 Jul 01 TA - Canadian Medical Association Journal PG - 56--56-a VI - 179 IP - 1 4099 - http://www.cmaj.ca/content/179/1/56.2.short 4100 - http://www.cmaj.ca/content/179/1/56.2.full SO - CMAJ2008 Jul 01; 179