Polycythemia VeraPolycythemiaThrombocythemia, EssentialJanus Kinase 2Primary MyelofibrosisMyeloproliferative DisordersThrombocytosisPipobromanErythroid Precursor CellsErythropoietinPhlebotomyBone and BonesErythropoiesisReceptors, ThrombopoietinReceptors, ErythropoietinHematocritAloeGranulocytesBloodlettingBone MarrowThrombosisHematopoiesis, ExtramedullaryHydroxyureaBone RemodelingMutation, MissenseMutationGPI-Linked ProteinsVon Hippel-Lindau Tumor Suppressor ProteinAmino Acid SubstitutionErythroid CellsHomozygotePlatelet CountIsoantigensColony-Forming Units AssayMegakaryocytesErythrocyte VolumeBudd-Chiari SyndromeBone DensityHematopoietic Stem CellsSomatostatinomaRussiaBone Marrow CellsLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeThrombopoietinChromosomes, Human, 19-20LeukocytosisSplenomegaly