Primary MyelofibrosisThrombocythemia, EssentialCalreticulinJanus Kinase 2Polycythemia VeraMyeloproliferative DisordersReceptors, ThrombopoietinSplenomegalyMyelodysplastic-Myeloproliferative DiseasesMutationMutation, MissenseThrombocytosisSea-Blue Histiocyte SyndromeBone MarrowMegakaryocytesPoint MutationPrognosisCalbindin 2KaryotypingHematopoiesis, ExtramedullaryPlatelet CountAmino Acid SubstitutionWorld Health OrganizationBone Marrow DiseasesReticulinFrameshift MutationDisease ProgressionOsteosclerosisSurvival Rate