Keywords: Hypereosinophilic syndrome; Monoclonal antibody; IL-5; AEC; Absolute eosinophil count; CEL-NOS; Chronic eosinophilic leukemia-not otherwise specified; EGID; Eosinophilic gastrointestinal disorder; EGPA; Eosinophilic granulomatosis with polyangiitis; EoE;