Vitamin D DeficiencyVitamin DCholecalciferolCalcifediolSunlightVitaminsErgocalciferolsPrevalenceParathyroid HormoneVitamin ADietary SupplementsReceptors, Calcitriol25-Hydroxyvitamin D 2SeasonsRicketsCalcitriolVitamin EHydroxycholecalciferols25-Hydroxyvitamin D3 1-alpha-HydroxylaseBone DensityVitamin A DeficiencyVitamin B 12Cross-Sectional StudiesCalcium, DietaryVitamin D-Binding ProteinRisk FactorsHypocalcemiaOsteomalaciaNutritional StatusBone Density Conservation AgentsCalciumOsteoporosisBiological MarkersAfrican AmericansAdrenal InsufficiencyFractures, BoneVitamin B 12 DeficiencyEuropean Continental Ancestry GroupBone and BonesVitamin E DeficiencyProspective StudiesVitamin K 1Skin PigmentationVitamin B 6PregnancyCohort Studies24,25-Dihydroxyvitamin D 3HyperuricemiaRenal InsufficiencyDihydroxycholecalciferolsVitamin K DeficiencyPhosphorusDietLogistic ModelsPostmenopauseVitamin B 6 DeficiencyBody Mass IndexVenous InsufficiencyUnited StatesRegression AnalysisExocrine Pancreatic InsufficiencyHyperparathyroidism, SecondaryCholestanetriol 26-MonooxygenaseVitamin D Response ElementChromatography, LiquidAscorbic AcidSteroid HydroxylasesTandem Mass SpectrometryAlkaline PhosphatasePlacental InsufficiencyGuadeloupeInfant, NewbornNutritional RequirementsNutrition PolicyPhosphatesCase-Control StudiesBone DiseasesAsymptomatic DiseasesBone Diseases, MetabolicClothingHypophosphatemiaJudaismTreatment OutcomeParathyroid GlandsTurkeySeverity of Illness IndexNutrition SurveysMultivariate AnalysisAge FactorsOsteocalcinRenal Insufficiency, ChronicChronic DiseaseAfrican Continental Ancestry GroupRetrospective StudiesPyridoxineIranQatarTime FactorsVitamin K 2Vitamin B Deficiency