1Andrès E,Federici L,Serraj K,et al.Update of nutrient-deficiency anemia in elderly patients[J].Eur J Intern Med,2008;19(7):488-93.
2Hao L,Ma J,Zhu J,et al.Vitamin B-12 deficiency is prevalent in 35-to 64-year-old Chinese adults[J].J Nutr,2007;137(5):1278-85.
3Selhub J,Morris MS,Jacques PF,et al.Folate-vitamin B-12 interaction in relation to cognitive impairment,anemia,and biochemical indicators of vitamin B-12 deficiency[J].Am J Clin Nutr,2009;89(2):702-6.
4Brouwer I,Verhoef P.Folic acid fortification:is masking of vitamin B-12 deficiency what we should really worry about[J].Am J Clin Nutr,2007;86(4):897-8.
6Turgut B,Turgut N,Akpinar S,et al.Dorsal sural nerve conduction study in vitamin B(12)deficiency with megaloblastic anemia[J].J Peripher Nerv Syst,2006;11(3):247-52.
7McLean E,de Benoist B,Allen LH.Review of the magnitude of folate and vitamin B12 deficiencies worldwide[J].Food Nutr Bull,2008;29(2):38-51.
8Kloosterman J,de Jong N,Rompelberg CJ,et al.Folic acid fortification:prevention as well as promotion of cancer[J].Ned Tijdschr Geneeskd,2006;150(26):1443-8.
9Aslinia F,Mazza JJ,Yale SH.Megaloblastic anemia and other causes of macrocytosis[J].Clin Med Res,2006;4(3):236-41.
10Green R.Indicators for assessing folate and vitamin B12 status and for monitoring the efficacy of intervention strategies[J].Food Nutr Bull,2008;29(21):52-63.