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the serum B12 concentration of a given person may be 240 pmol/l with one assay, and 440 pmol/l with a different assay There is also considerable variability with just one and the same serum B12 assay
& William McCormick Chair of the department of Biochemistry and Molecular Biology at The George Washington University School of Medicine and Health Sciences, where he has served since 1978
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He M, Li X, Liu Y, et al
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