PT - JOURNAL ARTICLE ED - , TI - Briefly AID - 10.1503/cmaj.109-4226 DP - 2012 Jul 10 TA - Canadian Medical Association Journal PG - E535--E538 VI - 184 IP - 10 4099 - http://www.cmaj.ca/content/184/10/E535.short 4100 - http://www.cmaj.ca/content/184/10/E535.full SO - CMAJ2012 Jul 10; 184