Anemia due to iron deficiency was defined in a study on children as Hb < 11 g/dl and ferritin < 15 μg/L (79), and in a study on pregnant women, anemia was defined as Hb < 11 g/dl, and low ferritin level as values <12 μg/L (80). Here, GSTM1 is linked to Iron deficiency anemia.