PT - JOURNAL ARTICLE ED - , TI - Correction AID - 10.1503/cmaj.109-2045 DP - 2009 Nov 24 TA - Canadian Medical Association Journal PG - 827--827-b VI - 181 IP - 11 4099 - http://www.cmaj.ca/content/181/11/827.3.short 4100 - http://www.cmaj.ca/content/181/11/827.3.full SO - CMAJ2009 Nov 24; 181