PT - JOURNAL ARTICLE ED - , TI - Corrections AID - 10.1503/cmaj.1040948 DP - 2004 Jul 06 TA - Canadian Medical Association Journal PG - 16--16-a VI - 171 IP - 1 4099 - http://www.cmaj.ca/content/171/1/16.2.short 4100 - http://www.cmaj.ca/content/171/1/16.2.full SO - CMAJ2004 Jul 06; 171