Polycythemia VeraPolycythemiaPrimary MyelofibrosisJanus Kinase 2Janus KinasesThrombocythemia, EssentialPyrazolesMyeloproliferative DisordersSplenomegalyJanus Kinase 1PipobromanThrombocytosisProtein Kinase InhibitorsErythroid Precursor CellsAloeErythropoietinThrombocytopeniaPhlebotomyReceptors, ThrombopoietinClinical Trials, Phase III as TopicIntention to Treat AnalysisDrug ApprovalErythropoiesisClinical Trials, Phase I as TopicGranulocytesClinical Trials, Phase II as TopicReceptors, ErythropoietinThrombosisHydroxyureaBloodlettingHematocritSpleenMutation, MissenseFollow-Up StudiesHematopoiesis, ExtramedullaryErythroid CellsMutationAmino Acid SubstitutionGPI-Linked ProteinsPlatelet CountOrgan SizeMegakaryocytesTreatment OutcomeColony-Forming Units AssayBudd-Chiari SyndromeIsoantigensLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeChromosomes, Human, 19-20ThrombopoietinBone MarrowHomozygote