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Abstract
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Keywords:
Age FactorsBreast Cancer--etiologyCancerContraceptionContraceptive AgentsContraceptive Agents, FemaleContraceptive Methods--side effectsDemographic FactorsDiseasesEpidemiologic MethodsFamily PlanningLongterm EffectsNeoplasmsOral Contraceptives, Combined--side effectsOral Contraceptives--side effectsPopulationPopulation At RiskPopulation CharacteristicsPopulation DynamicsResearch MethodologyTime Factors