RT Journal Article SR Electronic T1 Preventing congenital varicella syndrome with immunization JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E169 OP E170 DO 10.1503/cmaj.110055 VO 183 IS 3 A1 Sauerbrei, Andreas YR 2011 UL http://www.cmaj.ca/content/183/3/E169.abstract AB