Myeloproliferative DisordersPolycythemia VeraThrombocythemia, EssentialPrimary MyelofibrosisThrombocytosisJanus Kinase 2Receptors, ThrombopoietinLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeLeukemia, Myelogenous, Chronic, BCR-ABL PositiveFusion Proteins, bcr-ablBone MarrowChronic DiseaseLeukemia, Myelomonocytic, JuvenileSplenomegalyLeukemia, Myelomonocytic, ChronicMegakaryocytesHematopoiesis, ExtramedullaryHematopoietic Stem CellsMutationBenzamidesReceptor, Platelet-Derived Growth Factor betaMyelodysplastic SyndromesLeukemia, MyeloidGenes, ablLeukocytosisSTAT5 Transcription FactorOncogene Proteins, Fusion