RT Journal Article SR Electronic T1 Contraception in women over 40 years of age JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 565 OP 573 DO 10.1503/cmaj.121280 VO 185 IS 7 A1 Allen, Rebecca H. A1 Cwiak, Carrie A. A1 Kaunitz, Andrew M. YR 2013 UL http://www.cmaj.ca/content/185/7/565.abstract AB