PT - JOURNAL ARTICLE ED - , TI - Corrections AID - 10.1503/cmaj.1040216 DP - 2004 Mar 02 TA - Canadian Medical Association Journal PG - 771--771-b VI - 170 IP - 5 4099 - http://www.cmaj.ca/content/170/5/771.3.short 4100 - http://www.cmaj.ca/content/170/5/771.3.full SO - CMAJ2004 Mar 02; 170