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Vitamin B12 deficiency.
Killen JP, Brenninger VL. Killen JP, et al. Among authors: brenninger vl. N Engl J Med. 2013 May 23;368(21):2040-1. doi: 10.1056/NEJMc1304350. N Engl J Med. 2013. PMID: 23697527 No abstract available.