RT Journal Article SR Electronic T1 Mandatory vaccinations: The international landscape JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1167 OP E1168 DO 10.1503/cmaj.109-3993 VO 183 IS 16 A1 Walkinshaw, Erin YR 2011 UL http://www.cmaj.ca/content/183/16/E1167.abstract AB