A critical look at the Sydney classification of gastritis.
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D005060:Europe; D005756:Gastritis / Q000145:classification* / Q000175:diagnosis / Q000382:microbiology; D005773:Gastroscopy; D016481:Helicobacter Infections / Q000175:diagnosis; D016480:Helicobacter pylori / Q000302:isolation & purification; D006801:Humans; D014481:United States