GSTM1 and hypochromic anemia: Hematological indices of the pregnant wife are listed in Table 2, with, 90 g/L Hb (normal range: 120‐160 g/L),71.0 fL mean corpuscular volume (MCV) (normal range: 80.0‐100.0 fL), and 22.7 pg mean corpuscular hemoglobin (MCH) (normal range: 27.0‐34 pg), supporting the diagnosis of mild microcytic hypochromic anemia.