RT Journal Article SR Electronic T1 Reproductive health experts warn women not to abandon birth control JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E517 OP E518 DO 10.1503/cmaj.109-4529 VO 185 IS 11 A1 Tibbetts, Janice YR 2013 UL http://www.cmaj.ca/content/185/11/E517.abstract AB