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Gastroesophageal Reflux
Colonic Diseases
Esophageal Achalasia
Gastrointestinal Hemorrhage
Helicobacter Infections
Pancreatic Neoplasms
Esophagus
Colonoscopy
Manometry
Esophagoscopy
Endoscopy
Double-Blind Method
Bismuth
Anti-Ulcer Agents
Ranitidine
Recurrence
Hydrogen-Ion Concentration
Sensitivity and Specificity
Prospective Studies
Helicobacter pylori
Co-Publications
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