Hypereosinophilic SyndromeEosinophiliaEosinophilsReceptor, Platelet-Derived Growth Factor alphamRNA Cleavage and Polyadenylation FactorsSyndromeInterleukin-5Eosinophil Granule ProteinsChurg-Strauss SyndromeBenzamidesEndomyocardial FibrosisChemokine CCL17PiperazinesPyrimidinesPulmonary EosinophiliaMastocytosisMastocytosis, SystemicPrednisolonePrednisoneAdrenal Cortex HormonesOncogene Proteins, FusionMyeloproliferative DisordersFatal OutcomeLeukocyte CountHydroxyureaEosinophil Peroxidase