Polycythemia VeraPolycythemiaThrombocythemia, EssentialJanus Kinase 2ThrombosisPrimary MyelofibrosisMyeloproliferative DisordersVenous ThrombosisThrombocytosisPipobromanErythroid Precursor CellsAloeErythropoietinPhlebotomyReceptors, ThrombopoietinErythropoiesisGranulocytesCoronary ThrombosisReceptors, ErythropoietinHydroxyureaSinus Thrombosis, IntracranialHematocritBloodlettingMutation, MissenseMutationBudd-Chiari SyndromePlatelet CountHematopoiesis, ExtramedullaryIntracranial ThrombosisErythroid CellsAmino Acid SubstitutionGPI-Linked ProteinsCarotid Artery ThrombosisMegakaryocytesColony-Forming Units AssayIsoantigensHomozygoteThrombopoietinLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeChromosomes, Human, 19-20Bone MarrowSplenomegalyHematopoietic Stem CellsLeukocytosis