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Summary
No abstract available in PubMed .
Keywords:
AmericasBiologyCancerContraceptionContraceptive Methods--beneficial effectsDeveloped CountriesDiseasesEndocrine SystemEndometrial CancerEstrogensFamily PlanningHormonesNeoplasmsNorth AmericaNorthern AmericaOral Contraceptives, Combined--beneficial effectsOral Contraceptives--beneficial effectsOvarian CancerPhysiologyProgestational HormonesProgesteroneUnited States