PT - JOURNAL ARTICLE ED - , TI - Correction AID - 10.1503/cmaj.1041127 DP - 2004 Aug 17 TA - Canadian Medical Association Journal PG - 313--313-b VI - 171 IP - 4 4099 - http://www.cmaj.ca/content/171/4/313.3.short 4100 - http://www.cmaj.ca/content/171/4/313.3.full SO - CMAJ2004 Aug 17; 171