The development of vitamin B12 deficiency by untreated patients with pernicious anemia.
D000740:Anemia; D000752:Anemia, Pernicious; D006801:Humans; D008499:Medical Records; D014806:Vitamin B 12 Deficiency / Q000209:etiology*
ANEMIA, PERNICIOUS/case reports; VITAMIN B12 DEFICIENCY/etiology and pathogenesis