title: Gastrointestinal investigation of iron deficiency anemia.
mesh_terms: D000328:Adult; D000368:Aged; D000747:Anemia, Hypochromic / Q000209:etiology*; D003110:Colonic Neoplasms / Q000150:complications*; D004724:Endoscopy; D005260:Female; D006801:Humans; D008875:Middle Aged