PT - JOURNAL ARTICLE ED - , TI - Correction AID - 10.1503/cmaj.061713 DP - 2007 Jan 16 TA - Canadian Medical Association Journal PG - 213--213 VI - 176 IP - 2 4099 - http://www.cmaj.ca/content/176/2/213.short 4100 - http://www.cmaj.ca/content/176/2/213.full SO - CMAJ2007 Jan 16; 176