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Marriage season, promptness of successful pregnancy and first-born sex ratio in a historical natural fertility population - evidence for sex-dependent early pregnancy loss?

ContraceptionReproductive SuccessFertilityTeenage PregnancyGender StudiesReproductive HealthMarriage SeasonGynecologyMaternal HealthSuccessful PregnancyReproductive BiologyDemographyPublic HealthMedicineMarriageFertility TrackingFirst-born Sex Ratio