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Vitamin D insufficiency in pregnant and nonpregnant women of childbearing age in the United States

Pregnancy NutritionNutritionVitamin D InsufficiencyMedicineReproductive HealthNonpregnant WomenGynecologyMaternal HealthPregnancyMaternal-fetal MedicineMaternal NutritionPublic HealthUnited StatesMicronutrient SupplementationWomen's HealthHigh-risk Pregnancy