Primary MyelofibrosisPolycythemia VeraPolycythemiaThrombocythemia, EssentialJanus Kinase 2Myeloproliferative DisordersThrombocytosisReceptors, ThrombopoietinSplenomegalyPipobromanBone MarrowMyelodysplastic-Myeloproliferative DiseasesMegakaryocytesSea-Blue Histiocyte SyndromeMutationErythroid Precursor CellsHematopoiesis, ExtramedullaryAloeErythropoietinPlatelet CountMutation, MissensePhlebotomyPrognosisAmino Acid SubstitutionErythropoiesisKaryotypingGranulocytesHydroxyureaThrombosisWorld Health OrganizationReceptors, ErythropoietinThrombopoietinDisease ProgressionBloodlettingHematocritReticulinRisk FactorsErythroid CellsLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeHematopoietic Stem CellsColony-Forming Units AssaySurvival RateOsteosclerosisGPI-Linked Proteins