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Guo Q, Jin Y, Chen X, Ye X, Shen X, Lin M, Zeng C, Zhou T, Zhang J
Using metabolic markers of B12 status like methylmalonic acid and homocysteine to aid in the diagnosis of clinically manifested vitamin B12 deficiency has advantages, but also shortcomings [10,11], such as the high costs of measurements, the limited availability, and the impact of renal insufficiency on the concentrations

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