Likewise, Michaux et al. (2019) reported a range of blood measures as outcomes related to this programme, including serum ferritin, serum zinc, soluble transferrin receptor (sTfR), retinol binding protein, C‐reactive protein, α‐1 acid glycoprotein (AGP), and Hb concentrations, as well as anaemia rates for nonpregnant women. This evidence concerns the gene GSTM1 and anemia (phenotype).