RT Journal Article SR Electronic T1 Listeriosis complicating pregnancy JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association DO 10.1503/cmaj.090395 A1 Cheung, Vincent YT A1 Sirkin, Wilma L YR 2009 UL http://www.cmaj.ca/content/early/2009/09/28/cmaj.090395.abstract AB