PT - JOURNAL ARTICLE ED - , TI - Physicians and advocacy AID - 10.1503/cmaj.050521 DP - 2005 May 24 TA - Canadian Medical Association Journal PG - 1413--1413 VI - 172 IP - 11 4099 - http://www.cmaj.ca/content/172/11/1413.short 4100 - http://www.cmaj.ca/content/172/11/1413.full SO - CMAJ2005 May 24; 172