Polycythemia VeraThrombocythemia, EssentialPolycythemiaJanus Kinase 2ThrombocytosisPrimary MyelofibrosisMyeloproliferative DisordersReceptors, ThrombopoietinPipobromanThrombosisErythroid Precursor CellsPlatelet CountHydroxyureaMegakaryocytesAloeGranulocytesErythropoietinThrombopoietinPhlebotomyMutation, MissenseCarbazilquinoneMutationErythropoiesisAmino Acid SubstitutionLeukocytosisLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeGPI-Linked ProteinsSplenomegalyPostoperative ComplicationsBone MarrowReceptors, ErythropoietinIsoantigensHematocritBloodlettingHomozygoteBlood PlateletsRetrospective StudiesHematopoietic Stem CellsHematopoiesis, ExtramedullaryPoint MutationPlatelet Aggregation InhibitorsFollow-Up StudiesErythroid CellsThrombocytopeniaReceptors, CytokineDNA Mutational AnalysisThrombopoiesisHeterozygoteTreatment OutcomeInterferon-alphaLeukemia, Myelogenous, Chronic, BCR-ABL PositiveErythrocyte InclusionsColony-Forming Units AssayProto-Oncogene ProteinsBudd-Chiari SyndromeHematopoiesisHemorrhageAnemia, Refractory