PT - JOURNAL ARTICLE ED - , TI - Corrections AID - 10.1503/cmaj.071745 DP - 2008 Jan 01 TA - Canadian Medical Association Journal PG - 66--66-d VI - 178 IP - 1 4099 - http://www.cmaj.ca/content/178/1/66.5.short 4100 - http://www.cmaj.ca/content/178/1/66.5.full SO - CMAJ2008 Jan 01; 178