Polycythemia VeraPolycythemiaThrombocythemia, EssentialJanus Kinase 2Myeloproliferative DisordersErythropoietinPrimary MyelofibrosisErythroid Precursor CellsPhlebotomyBloodlettingPipobromanThrombocytosisHematocritErythropoiesisReceptors, ErythropoietinHemoglobins, AbnormalReceptors, ThrombopoietinAloeHypoxia-Inducible Factor-Proline DioxygenasesDiphosphoglyceric AcidsColony-Forming Units AssayChromium IsotopesGranulocytesMutationMutation, MissenseErythrocyte VolumeThrombosisErythrocyte CountHydroxyureaHemoglobinsBone MarrowProcollagen-Proline DioxygenaseBlood Protein ElectrophoresisHematopoiesis, ExtramedullaryErythroid CellsAmino Acid SubstitutionHeterozygoteGPI-Linked ProteinsPlatelet CountIron-Dextran ComplexMegakaryocytesExonsDNA Mutational AnalysisErythrocytesBudd-Chiari SyndromeIsoantigensOxygenLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeChromosomes, Human, 19-20ThrombopoietinPedigreeAltitude