RT Journal Article SR Electronic T1 Measles resurgence prompts debate over mandatory vaccination JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E676 OP E677 DO 10.1503/cmaj.109-5763 VO 191 IS 24 A1 Marie-Claude Grégoire YR 2019 UL http://www.cmaj.ca/content/191/24/E676.abstract