Blood type, blood clot, and the pill.
D000017:ABO Blood-Group System; D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans; D013548:Sweden; D013923:Thromboembolism / Q000139:chemically induced* / Q000453:epidemiology; D006113:United Kingdom; D014481:United States
D000017:ABO Blood-Group System; D003276:Contraceptives, Oral