Polycythemia VeraPolycythemiaThrombocythemia, EssentialJanus Kinase 2Primary MyelofibrosisMyeloproliferative DisordersThrombocytosisPipobromanBlood PlateletsErythroid Precursor CellsErythropoietinPhlebotomyPlatelet AggregationPlatelet CountReceptors, ThrombopoietinErythropoiesisReceptors, ErythropoietinHematocritAloeThrombosisGranulocytesBloodlettingHydroxyureaHematopoiesis, ExtramedullaryPlatelet AdhesivenessMegakaryocytesMutation, MissenseMutationGPI-Linked ProteinsVon Hippel-Lindau Tumor Suppressor ProteinAmino Acid SubstitutionErythroid CellsHomozygoteIsoantigensColony-Forming Units AssayPlatelet Membrane GlycoproteinsThrombopoietinErythrocyte VolumeBone MarrowBudd-Chiari SyndromeSomatostatinomaRussiaHematopoietic Stem CellsLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeChromosomes, Human, 19-20LeukocytosisSplenomegalyThrombocytopenia