<style face="normal" font="default" size="100%">Comorbidities affect risk of nonvariceal upper gastrointestinal bleeding</style>

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31<style face="normal" font="default" size="100%">Comorbidities affect risk of nonvariceal upper gastrointestinal bleeding</style><style face="normal" font="default" size="100%">Comorbidities affect risk of nonvariceal upper gastrointestinal bleeding</style>