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Abstract
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Keywords:
AmericasBirth HistoryDemographic FactorsDeveloped CountriesDeveloping CountriesFertilityFertility MeasurementsNorth AmericaNorthern AmericaPopulationPopulation DynamicsPregnancyPregnancy HistoryPregnancy, PlannedReproductionReproductive BehaviorRetrospective StudiesSeasonal VariationStatistical RegressionUnited States