DoH seems to have underestimated incidence of venous thromboembolism in users of combined oral contraceptives.
Lawrenson
R A
RA
Whalley
A
A
Simpson
E
E
Farmer
R D
RD
D003277:Contraceptives, Oral, Combined / Q000009:adverse effects*; D005260:Female; D006801:Humans; D015994:Incidence; D013923:Thromboembolism / Q000139:chemically induced*; D006113:United Kingdom / Q000453:epidemiology; D020246:Venous Thrombosis / Q000139:chemically induced*
D003277:Contraceptives, Oral, Combined