PT - JOURNAL ARTICLE ED - , TI - Corrections AID - 10.1503/cmaj.061609 DP - 2007 Jan 02 TA - Canadian Medical Association Journal PG - 70--70-b VI - 176 IP - 1 4099 - http://www.cmaj.ca/content/176/1/70.3.short 4100 - http://www.cmaj.ca/content/176/1/70.3.full SO - CMAJ2007 Jan 02; 176