"The pill".
D003270:Contraceptive Agents / Q000009:adverse effects; D003276:Contraceptives, Oral / Q000008:administration & dosage / Q000009:adverse effects*; D004812:Epidemiologic Methods; D002542:Intracranial Embolism and Thrombosis / Q000139:chemically induced; D012189:Retrospective Studies; D012494:Sampling Studies; D013223:Statistics as Topic; D013924:Thrombophlebitis / Q000139:chemically induced
D003270:Contraceptive Agents; D003276:Contraceptives, Oral