PT - JOURNAL ARTICLE ED - , TI - Corrections AID - 10.1503/cmaj.070919 DP - 2007 Jul 31 TA - Canadian Medical Association Journal PG - 271--271 VI - 177 IP - 3 4099 - http://www.cmaj.ca/content/177/3/271.1.short 4100 - http://www.cmaj.ca/content/177/3/271.1.full SO - CMAJ2007 Jul 31; 177