PhlebotomyBlood Specimen CollectionBloodlettingHemochromatosisPolycythemiaIron OverloadAnemia, NeonatalTissue DonorsBlood DonorsPolycythemia VeraChelation TherapyFerritinsIronErythropoietinLiving DonorsPorphyria Cutanea TardaHematocritCerebrospinal Fluid PressureBlood Volume DeterminationAnemiaErythropoiesisBlood Component TransfusionBlood TransfusionHemoglobinsNitrilotriacetic AcidSpecimen HandlingPhenylhydrazines