RT Journal Article SR Electronic T1 Flu pandemic prompts other vaccination delays JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E169 OP E169 DO 10.1503/cmaj.109-3043 VO 181 IS 8 A1 Roger Collier YR 2009 UL http://www.cmaj.ca/content/181/8/E169.abstract