2Allen LH. Pregnancy and iron deficiency: unresolved issues [J] . Nutr Review, 1997, 55:91.
3Akesson A, Bjellemp P, Berglund M et al. Serum transferrin receptor: a specific marker of iron deficiency in pregnancy [J] . Am J Clin Nutr, 1998, 68:1241.
6Pauli S. Serum trans ferrin receptor and transferrin reeept - ferritin index identify healthy sypjects with subclinicaliron deficits. Blood, 1998,92:2934 -2939.