PhlebotomyBloodlettingDiagnostic Techniques and ProceduresIatrogenic DiseaseHemochromatosisCholangiopancreatography, Endoscopic RetrogradePolycythemiaIron OverloadAnemia, NeonatalTreatment OutcomeRetrospective StudiesPolycythemia VeraChelation TherapyFerritinsTime FactorsIronCardiac CatheterizationErythropoietinProspective StudiesPorphyria Cutanea TardaHematocritFollow-Up StudiesBlood Specimen CollectionCerebrospinal Fluid PressureBlood Volume DeterminationAnemiaErythropoiesisBlood Component TransfusionHemoglobinsNitrilotriacetic AcidBlood TransfusionPhenylhydrazines