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Vitamin B12 deficiency. New Engl J Med 368(2): 149-160.","DOI":"10.1056\/NEJMcp1113996"},{"key":"26","unstructured":"26) WHO. 2015. Serum and red blood cell folate concentrations for assessing folate status in populations."},{"key":"27","unstructured":"27) Kumar N. 2017. Nutrients and neurology. Continuum (Minneap Minn) 23(3, Neurology of Systemic Disease): 822-861."},{"key":"28","doi-asserted-by":"crossref","unstructured":"28) Green R, Datta Mitra A. 2017. Megaloblastic anemias: Nutritional and other causes. Med Clin North Am 101(2): 297-317.","DOI":"10.1016\/j.mcna.2016.09.013"},{"key":"29","doi-asserted-by":"crossref","unstructured":"29) El-Qudah JM, Dababneh BF, Al-Qudah MM, Haddad M. 2013. Serum vitamin B12 levels related to weight status among healthy Jordanian students. Laboratory Medicine 44(1): 34-39.","DOI":"10.1309\/LMG2E7PEDHET5QVI"},{"key":"30","doi-asserted-by":"crossref","unstructured":"30) Barghouti FF, Younes NA, Halaseh LJ, Said TT, Ghraiz SM. 2009. 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