RT Journal Article SR Electronic T1 The human papillomavirus vaccine and risk of anaphylaxis JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 509 OP 510 DO 10.1503/cmaj.081133 VO 179 IS 6 A1 Halsey, Neal A. YR 2008 UL http://www.cmaj.ca/content/179/6/509.abstract