Polycythemia VeraPolycythemiaPrimary MyelofibrosisThrombocythemia, EssentialJanus Kinase 2Myeloproliferative DisordersJanus KinasesPyrazolesPipobromanThrombocytosisSplenomegalyDisease ProgressionErythroid Precursor CellsAloeErythropoietinPhlebotomyJanus Kinase 1Receptors, ThrombopoietinErythropoiesisProtein Kinase InhibitorsGranulocytesThrombocytopeniaReceptors, ErythropoietinThrombosisHydroxyureaBloodlettingHematocritMutationMutation, MissenseHematopoiesis, ExtramedullaryErythroid CellsClinical Trials, Phase III as TopicAmino Acid SubstitutionIntention to Treat AnalysisGPI-Linked ProteinsPlatelet CountDrug ApprovalClinical Trials, Phase I as TopicMegakaryocytesColony-Forming Units AssayBudd-Chiari SyndromeFollow-Up StudiesIsoantigensLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeChromosomes, Human, 19-20ThrombopoietinHomozygoteBone MarrowHematopoietic Stem Cells