Polycythemia VeraThrombocytosisPolycythemiaThrombocythemia, EssentialJanus Kinase 2Myeloproliferative DisordersPrimary MyelofibrosisPlatelet CountPipobromanReceptors, ThrombopoietinThrombopoietinErythroid Precursor CellsAnemia, RefractoryErythropoietinAloeMegakaryocytesPhlebotomyAnemia, SideroblasticLeukocytosisThrombosisErythropoiesisSplenomegalyGranulocytesThrombopoiesisBlood PlateletsReceptors, ErythropoietinHydroxyureaMutationMutation, MissenseBloodlettingHematocritThrombocytopeniaAmino Acid SubstitutionBone MarrowParaneoplastic SyndromesSplenectomyHematopoiesis, ExtramedullaryErythroid CellsHematopoietic Stem CellsGPI-Linked ProteinsHematopoiesisErythrocyte InclusionsTuberculomaColony-Forming Units AssaySelenium RadioisotopesBudd-Chiari SyndromeIsoantigensLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeChromosomes, Human, 19-20HemoglobinsHomozygote