Long-term use of oral contraceptives and risk of invasive cervical cancer.
Brinton L A, Huggins G R, Lehman H F, +5 more·International journal of cancer
To evaluate the relationship between use of oral contraceptives and risk of invasive cervical cancer, a case-control study involving 479 patients and 789 population controls was undertaken in 5 geographic regions of the US. Initially, the relationship was obscured by confounding variables, particularly the interval sin…