title: Elective surgery and the pill.
mesh_terms: D001777:Blood Coagulation / Q000187:drug effects*; D003276:Contraceptives, Oral / Q000009:adverse effects*; D004967:Estrogens / Q000009:adverse effects*; D005260:Female; D006801:Humans
chemical_list: D003276:Contraceptives, Oral; D004967:Estrogens