PT - JOURNAL ARTICLE ED - , TI - Correction AID - 10.1503/cmaj.070143 DP - 2007 Feb 27 TA - Canadian Medical Association Journal PG - 659--659-b VI - 176 IP - 5 4099 - http://www.cmaj.ca/content/176/5/659.3.short 4100 - http://www.cmaj.ca/content/176/5/659.3.full SO - CMAJ2007 Feb 27; 176