This is a multi-center prospective case control study aiming to compare different methods of risk stratification models in predicting the risk of gastric cancer development.
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Endoscopic grading of atrophic gastritis (Kimura Takemoto Classification)
Timeframe: Cross sectional study, day 0
Endoscopic grading of intestinal metaplasia (EGGIM)
Timeframe: Cross sectional study, day 0
Kyoto classification of gastritis
Timeframe: Cross sectional study, day 0
Operative links on gastritis assessment (OLGA)
Timeframe: Cross sectional study, day 0
Operative links on gastric intestinal metaplasia (OLGIM)
Timeframe: Cross sectional study, day 0