Diagnostic suspicion and referral bias in studies of venous thromboembolism and oral contraceptive use.
Vandenbroucke
J P
JP
Bloemenkamp
K W
KW
Helmerhorst
F M
FM
Büller
H R
HR
Rosendaal
F R
FR
D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans; D012017:Referral and Consultation; D020246:Venous Thrombosis / Q000139:chemically induced* / Q000175:diagnosis
D003276:Contraceptives, Oral