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Is daily 400 IU of vitamin D supplementation appropriate for every country: a cross-sectional study

NutritionPreventive MedicineNutritional RequirementGlobal HealthRural HealthPublic Health NutritionClinical NutritionInternational HealthNutritional ScienceHuman NutritionPublic HealthMedicineDaily 400Micronutrient SupplementationCross-sectional Study