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- https://www.ncbi.nlm.nih.gov/pubmed/28189172
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- https://www.ndtv.com/health/vitamin-b12-signs-and-symptoms-of-vitamin-b12-deficiency-know-food-sources-of-vitamin-b12-2087595
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2996160/
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