Scientific problems with a noncausal artifact.
Heinemann
L A
LA
Spitzer
W O
WO
Winkler
U H
UH
D016477:Artifacts; D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans; D013924:Thrombophlebitis / Q000139:chemically induced* / Q000453:epidemiology
D003276:Contraceptives, Oral