title: Repeated blood donations and erythropoietin levels.
mesh_terms: D000740:Anemia / Q000209:etiology; D001804:Blood Transfusion, Autologous; D004921:Erythropoietin / Q000097:blood*; D006801:Humans; D013997:Time Factors
chemical_list: D004921:Erythropoietin