PT - JOURNAL ARTICLE ED - , TI - Corrections AID - 10.1503/cmaj.080217 DP - 2008 Mar 11 TA - Canadian Medical Association Journal PG - 731--732 VI - 178 IP - 6 4099 - http://www.cmaj.ca/content/178/6/731.3.short 4100 - http://www.cmaj.ca/content/178/6/731.3.full SO - CMAJ2008 Mar 11; 178