GSTM1 and anemia: According to THE European Best Practice Guidelines (EBPG) published in 2004, a diagnosis of anemia is considered to be a hemoglobin concentration (Hb) of less than 11.5 g/dL in women, < 12 g/dL in men aged > 70 years, or < 13.5 g/dL in men aged ≤ 70 years [4].