Breast cancer found less frequently among pill users.
D000328:Adult; D000367:Age Factors; D001900:Boston; D001941:Breast Diseases / Q000453:epidemiology*; D001943:Breast Neoplasms / Q000453:epidemiology*; D003276:Contraceptives, Oral; D005260:Female; D006801:Humans; D008875:Middle Aged
D003276:Contraceptives, Oral