TY - JOUR T1 - Half a century of the oral contraceptive pill JF - Canadian Family Physician JO - Can Fam Physician SP - e757 LP - e760 VL - 58 IS - 12 AU - Pamela Verma Liao AU - Janet Dollin Y1 - 2012/12/01 UR - http://www.cfp.ca/content/58/12/e757.abstract N2 - ER -