[Vitamin B12 deficiency in megaloblastic anemia in vegans].
D000126:Achlorhydria / Q000150:complications; D000328:Adult; D000368:Aged; D000748:Anemia, Macrocytic / Q000209:etiology*; D000749:Anemia, Megaloblastic / Q000209:etiology*; D014676:Diet, Vegetarian; D005260:Female; D005494:Folic Acid Deficiency / Q000150:complications; D006801:Humans; D008297:Male; D014806:Vitamin B 12 Deficiency / Q000150:complications / Q000209:etiology*