title: Serum vitamin B12 levels and dual isotope test for vitamin B12 malabsorption in atrophic gastritis.
mesh_terms: D000328:Adult; D003037:Cobalt Radioisotopes; D005260:Female; D005756:Gastritis / Q000097:blood*; D005757:Gastritis, Atrophic / Q000097:blood*; D006801:Humans; D007408:Intestinal Absorption; D008297:Male; D008875:Middle Aged; D014805:Vitamin B 12 / Q000097:blood* / Q000378:metabolism
chemical_list: D003037:Cobalt Radioisotopes; D014805:Vitamin B 12