[Functional diagnosis of the gastrointestinal tract].
D005745:Gastric Acidity Determination; D041981:Gastrointestinal Tract; D005773:Gastroscopy; D006801:Humans; D007437:Intrinsic Factor
D007437:Intrinsic Factor
GASTRIC ACIDITY DETERMINATION; GASTROINTESTINAL SYSTEM; GASTROSCOPY; INTRINSIC FACTOR