RT Journal Article SR Electronic T1 Infectious disease experts expect the unexpected with respect to swine flu JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E38 OP E39 DO 10.1503/cmaj.091176 VO 181 IS 3-4 A1 Paul Webster YR 2009 UL http://www.cmaj.ca/content/181/3-4/E38.abstract