title: Vitamin B-12 deficiency. Consider non-invasive follow-up and malabsorption in old age.
authors.forename: Jörn
authors.initials: J
authors.lastname: Schneede
mesh_terms: D006801:Humans; D008286:Malabsorption Syndromes / Q000150:complications*; D014806:Vitamin B 12 Deficiency / Q000209:etiology*