<style face="normal" font="default" size="100%">Defining upper gastrointestinal bleeding from linked primary and secondary care data and the effect on occurrence and 28 day mortality</style>

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31<style face="normal" font="default" size="100%">Defining upper gastrointestinal bleeding from linked primary and secondary care data and the effect on occurrence and 28 day mortality</style><style face="normal" font="default" size="100%">Defining upper gastrointestinal bleeding from linked primary and secondary care data and the effect on occurrence and 28 day mortality</style>