1David Armstrong MRCP(UK),Rudolf Arnold MD,Meinhard Classen MD,Michael Fischer,Harald Goebell MD,Wolfgang Schepp MD,André L Blum MD. RUDER—A prospective, two-year, multicenter study of risk factors for duodenal ulcer relapse during maintenance therapy with ranitidine[J] 1994,Digestive Diseases and Sciences(7):1425～1433
