PT - JOURNAL ARTICLE ED - , TI - Correction AID - 10.1503/cmaj.071116 DP - 2007 Sep 11 TA - Canadian Medical Association Journal PG - 606--606-c VI - 177 IP - 6 4099 - http://www.cmaj.ca/content/177/6/606.4.short 4100 - http://www.cmaj.ca/content/177/6/606.4.full SO - CMAJ2007 Sep 11; 177