PT - JOURNAL ARTICLE ED - , TI - Correction AID - 10.1503/cmaj.071649 DP - 2007 Dec 04 TA - Canadian Medical Association Journal PG - 1530--1530-a VI - 177 IP - 12 4099 - http://www.cmaj.ca/content/177/12/1530.2.short 4100 - http://www.cmaj.ca/content/177/12/1530.2.full SO - CMAJ2007 Dec 04; 177