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In our recent case–control study on the association between non-steroidal anti-inflammatory drugs (NSAIDs) and upper gastrointestinal bleeding (UGIB), the risk of UGIB was higher in non-drinkers than in heavy-drinkers. To explore this unexpected finding, we re-analyzed the data to test whether non-drinking represented risk factors for UGIB and also conducted an additional survey to find any disagreement...
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