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AgricultureNutritionNutritional SciencesBioavailabilityClinical NutritionHuman NutritionInflammatory Bowel DiseaseIntestinal Calcium AbsorptionNutrition In Gastrointestinal DisordersVitamin DVitamin D DeficiencyVitamin D MetabolismDietary Vitamin D IntakeIntestinal Vitamin D AbsorptionNutrition In Crohn's DiseaseNutritional Vitamin D StatusVitamin D AssessmentVitamin D InsufficiencyVitamin D Intake AssessmentVitamin D Sufficiency
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Ann R. Webb, Loren Kline, Michael F. Holick · The Journal of Clinical Endocrinology & Metabolism · 1988 · 1.7K citations
Serum vitamin D concentrations among elderly people in Europe
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