RT Journal Article SR Electronic T1 Two-dose HPV regimen recommended in US JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E36 OP E36 DO 10.1503/cmaj.109-5350 VO 189 IS 1 A1 Collier, Roger YR 2017 UL http://www.cmaj.ca/content/189/1/E36.abstract