title: Calcium challenge in the Zollinger-Ellison syndrome.
mesh_terms: D007516:Adenoma, Islet Cell / Q000209:etiology; D002118:Calcium / Q000097:blood; D003937:Diagnosis, Differential; D004381:Duodenal Ulcer / Q000175:diagnosis* / Q000209:etiology; D005743:Gastrectomy; D005750:Gastric Juice / Q000378:metabolism*; D005755:Gastrins / Q000097:blood / Q000378:metabolism*; D006801:Humans; D007275:Injections, Intravenous; D014628:Vagotomy; D015043:Zollinger-Ellison Syndrome / Q000175:diagnosis*
chemical_list: D005755:Gastrins; D002118:Calcium