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Standard curves of placental weight and fetal/placental weight ratio in Japanese population: difference according to the delivery mode, fetal sex, or maternal parity

Japanese PopulationFertilityFetal SexReproductive HealthPediatricsGynecologyPregnancyMaternal HealthFetal MedicineMaternal-fetal MedicineMaternal NutritionPublic HealthPlacental WeightMedicineWomen's HealthHigh-risk Pregnancy