RT Journal Article SR Electronic T1 The H1N1 vaccine plan JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 500 OP 500 DO 10.1503/cmaj.109-2021 VO 181 IS 8 A1 Elwyn Griffiths YR 2009 UL http://www.cmaj.ca/content/181/8/500.1.abstract