Letter: Unwanted pregnancies.
D000032:Abortion, Therapeutic; D003267:Contraception / Q000706:statistics & numerical data*; D003276:Contraceptives, Oral; D005260:Female; D006801:Humans; D011247:Pregnancy; D011275:Pregnancy, Unwanted; D012189:Retrospective Studies
D003276:Contraceptives, Oral