RT Journal Article SR Electronic T1 Varenicline: cardiovascular safety JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1407 OP 1408 DO 10.1503/cmaj.111-2073 VO 183 IS 12 A1 Samuels, Larry YR 2011 UL http://www.cmaj.ca/content/183/12/1407.abstract