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27. Comparison of the radioisotope dilution-coated charcoal method and a microbiological method (L. leichmannii) for measuring vitamin B12 in serum. Raven JL, Walker PL, Barkhan P. J Clin Pathol; 1966 Nov; 19(6):610-3. PubMed ID: 5333257 [Abstract] [Full Text] [Related]
28. Prevalence of vitamin B12 deficiency among geriatric outpatients. Yao Y, Yao SL, Yao SS, Yao G, Lou W. J Fam Pract; 1992 Nov; 35(5):524-8. PubMed ID: 1331288 [Abstract] [Full Text] [Related]