in this case control study in consecutive prospective outpatients ( 571 cases and 1074 controls ) who had undergone diagnostic upper gastrointestinal endoscopy and routine biopsies from both antral and body mucosa , we calculated the risk of coexisting active du and/or gu in different gastritis of the antrum or body and according to grade ( superficial gastritis , mild , moderate or severe atrophic gastritis ) .
C0079304
upper
C0013303
du