PhlebotomyBloodlettingHemochromatosisPolycythemiaIron OverloadAnemia, NeonatalPolycythemia VeraChelation TherapyFerritinsIronErythropoietinPorphyria Cutanea TardaHematocritBlood Specimen CollectionSensitivity and SpecificityCerebrospinal Fluid PressureBlood Volume DeterminationAnemiaDiagnosis, OralSpecimen HandlingRetrospective StudiesErythropoiesisHemoglobinsBlood Component TransfusionNitrilotriacetic AcidBlood TransfusionPhenylhydrazines