Cytopenias were defined as follows: leukopenia for leukocytes <4 × 109/L, sex-adjusted anemia for hemoglobin (Hb) <11 g/dL for male and <10 g/dL for female, and thrombocytopenia for platelets <100 × 109/L. This evidence concerns the gene GSTM1 and anemia (phenotype).