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To evaluate whether climate change is associated with male:female ratios (sex ratios) of fetal deaths and births in Japan.A population-based cohort study.Not applicable.Newborn infants and fetuses spontaneously aborted after 12 weeks of gestation.None.Yearly sex ratios of fetal deaths and newborn infants and monthly fetal death rates and sex ratios of newborn infants.A statistically significant positive...
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