Polycythemia VeraPolycythemiaEye ManifestationsPrimary MyelofibrosisBloodlettingThrombocythemia, EssentialJanus Kinase 2Myeloproliferative DisordersJanus KinasesAloePyrazolesHematocritExchange Transfusion, Whole BloodPipobromanThrombocytosisSplenomegalyErythroid Precursor CellsLymphoceleHemoglobinometryBlood ViscosityErythropoietinPhlebotomyReceptors, ThrombopoietinPlasma VolumeCarboxyhemoglobinDiphosphoglyceric AcidsJanus Kinase 1Erythropoiesis