Primary MyelofibrosisPolycythemia VeraThrombocytosisThrombocythemia, EssentialMyeloproliferative DisordersPolycythemiaJanus Kinase 2HematocritHemoglobinsReceptors, ThrombopoietinPlatelet CountSplenomegalyMegakaryocytesPipobromanBone MarrowErythropoietinMyelodysplastic-Myeloproliferative DiseasesThrombopoietinMutationSea-Blue Histiocyte SyndromeHemoglobin AErythroid Precursor CellsHemoglobins, AbnormalAnemia, RefractoryHematopoiesis, ExtramedullaryAloeMutation, MissensePhlebotomyErythropoiesisPrognosisAmino Acid SubstitutionLeukocytosisAnemia, SideroblasticThrombosisAnemiaSplenectomyFetal HemoglobinKaryotypingGranulocytesHemoglobin, SickleBloodlettingBlood PlateletsThrombocytopeniaHydroxyureaThrombopoiesisWorld Health OrganizationReceptors, ErythropoietinHematopoietic Stem CellsRisk FactorsHematopoiesisDisease ProgressionErythroid CellsReticulinHemoglobin CParaneoplastic SyndromesBlood Cell CountLeukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative