RT Journal Article SR Electronic T1 Half a century of the oral contraceptive pill JF Canadian Family Physician JO Can Fam Physician FD The College of Family Physicians of Canada SP e757 OP e760 VO 58 IS 12 A1 Pamela Verma Liao A1 Janet Dollin YR 2012 UL http://www.cfp.ca/content/58/12/e757.abstract AB