RT Journal Article SR Electronic T1 Ads pressure Ontario to butt out in retail locations JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1544 OP 1544 DO 10.1503/cmaj.050546 VO 172 IS 12 A1 Christine Chénè YR 2005 UL http://www.cmaj.ca/content/172/12/1544.1.abstract