PT - JOURNAL ARTICLE ED - , TI - Correction AID - 10.1503/cmaj.1041458 DP - 2004 Sep 28 TA - Canadian Medical Association Journal PG - 712--712-a VI - 171 IP - 7 4099 - http://www.cmaj.ca/content/171/7/712.2.short 4100 - http://www.cmaj.ca/content/171/7/712.2.full SO - CMAJ2004 Sep 28; 171