Oral contraceptives, surgery and prolonged bed rest.
D000328:Adult; D000925:Anticoagulants / Q000627:therapeutic use; D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008875:Middle Aged; D011183:Postoperative Complications; D012146:Rest; D013923:Thromboembolism / Q000139:chemically induced* / Q000517:prevention & control
D000925:Anticoagulants; D003276:Contraceptives, Oral