DOI: 10.1055/s-00000020

Geburtshilfe und Frauenheilkunde

References

Hunter DJ, Manson JE, Colditz GA, Chason-Taber L, Troy L, Stampfer MJ, Speizer FE, Willet WC.
Reproducibility of oral contraceptive histories and validity of hormone composition reported in a cohort of US women. 
Contraception 1997; 56: 373-378  

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