PhlebotomyBloodlettingHemochromatosisIron OverloadPolycythemiaAnemia, NeonatalPolycythemia VeraChelation TherapyFerritinsIronErythropoietinPorphyria Cutanea TardaHematocritBlood Specimen CollectionCerebrospinal Fluid PressureBlood Volume DeterminationAnemiaErythropoiesisHemoglobinsBlood Component TransfusionNitrilotriacetic AcidBlood TransfusionPhenylhydrazines