title: Letter: Gastric acid and duodenogastric reflux.
mesh_terms: D001647:Bile Acids and Salts / Q000032:analysis; D004381:Duodenal Ulcer / Q000150:complications*; D004386:Duodenum / Q000378:metabolism; D005745:Gastric Acidity Determination; D005750:Gastric Juice / Q000032:analysis*; D005755:Gastrins / Q000097:blood; D005764:Gastroesophageal Reflux / Q000175:diagnosis* / Q000209:etiology; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007419:Intestinal Secretions / Q000032:analysis; D013048:Specimen Handling; D013276:Stomach Ulcer / Q000150:complications
chemical_list: D001647:Bile Acids and Salts; D005755:Gastrins