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Conclusion To the authors knowledge, this is the largest study to date examining patient safety and vitamin B12 deficiency

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Methods for the analysis of vitamin B 12 in food Several methods have been used to determine the vitamin B 12 content in foods including microbiological assays, chemiluminescence assays, polarographic, spectrophotometric, and high-performance liquid chromatography processes

When does persistent unexplained elevation justify evaluation for occult malignancy rather than interval observation