A common food factor as the etiological element in the geographical distribution of chronic peptic ulcer.
D005502:Food; D006801:Humans; D010437:Peptic Ulcer / Q000209:etiology*; D014805:Vitamin B 12 / Q000031:analogs & derivatives
C413332:factor A; D014805:Vitamin B 12
PEPTIC ULCER/etiology and pathogenesis