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Abstract
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Keywords:
AmericasBiologyChronic Diseases--prevention and controlCongenital Abnormalities--prevention and controlCritiqueDeficiency Diseases--prevention and controlDeveloped CountriesDeveloping CountriesDiseasesMetabolic EffectsNeonatal Diseases And AbnormalitiesNorth AmericaNorthern AmericaNutrition DisordersPhysiologyUnited StatesVitamin AVitamins