GSTM1 and pure red-cell aplasia: M: male, F: female, CsA: cyclosporin A, CS: corticosteroids, IgG: immunoglobulin G, Hb: hemoglobin, AIHA: autoimmune hemolytic anemia, MG: myasthenia gravis, GS: Good’s syndrome, PRCA: pure red cell aplasia, Ref.: reference number.