RT Journal Article SR Electronic T1 Measles outbreaks threaten those averse to vaccine JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E393 OP E394 DO 10.1503/cmaj.109-4480 VO 185 IS 9 A1 Cullen Bird YR 2013 UL http://www.cmaj.ca/content/185/9/E393.abstract AB