RT Journal Article SR Electronic T1 Mandatory vaccinations: The international landscape JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP cmaj.109-3993 DO 10.1503/cmaj.109-3993 A1 Walkinshaw, Erin YR 2011 UL http://www.cmaj.ca/content/early/2011/10/11/cmaj.109-3993.abstract AB