title: Combined therapies for upper gastrointestinal disorders--any advantage?
mesh_terms: D004359:Drug Therapy, Combination; D004381:Duodenal Ulcer / Q000188:drug therapy*; D004942:Esophagitis, Peptic / Q000188:drug therapy*; D006801:Humans; D010437:Peptic Ulcer / Q000188:drug therapy*