RT Journal Article SR Electronic T1 Direct-to-consumer advertising JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 770 OP 771 DO 10.1503/cmaj.1031915 VO 170 IS 5 A1 Barbara Mintzes A1 Kenneth L. Bassett A1 Morris L. Barer YR 2004 UL http://www.cmaj.ca/content/170/5/770.2.abstract