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Gastroesophageal Reflux
Duodenal Ulcer
Helicobacter Infections
Dyspepsia
Gastric Acidity Determination
Esophageal pH Monitoring
Breath Tests
Monitoring, Physiologic
Drug Therapy, Combination
Gastric Acid
Anti-Ulcer Agents
Omeprazole
Ranitidine
Histamine H2 Antagonists
Helicobacter pylori
Hydrogen-Ion Concentration
Circadian Rhythm
Treatment Outcome
Drug Administration Schedule
Prospective Studies
Co-Publications
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