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