Polycythemia VeraPolycythemiaThrombocythemia, EssentialJanus Kinase 2Primary MyelofibrosisMyeloproliferative DisordersPipobromanThrombocytosisErythroid Precursor CellsAloePhlebotomyErythropoietinReceptors, ThrombopoietinPostoperative ComplicationsVascular DiseasesDiabetic AngiopathiesErythropoiesisThrombosisGranulocytesReceptors, ErythropoietinHydroxyureaHematocritHemostatic TechniquesBloodlettingTreatment OutcomeRetrospective StudiesMutation, MissenseHematopoiesis, ExtramedullaryMutationErythroid CellsFemoral ArteryAmino Acid SubstitutionGPI-Linked ProteinsPlatelet CountAneurysm, FalseMegakaryocytesColony-Forming Units AssayBudd-Chiari SyndromeRisk FactorsCardiac CatheterizationFollow-Up StudiesIsoantigensLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeChromosomes, Human, 19-20ThrombopoietinBone MarrowGlycosylation End Products, AdvancedTime FactorsHomozygoteSplenomegalyHematopoietic Stem CellsHemorrhage