<style face="normal" font="default" size="100%">Relative risk of upper gastrointestinal complications among users of acetaminophen and nonsteroidal anti-inflammatory drugs</style>

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31<style face="normal" font="default" size="100%">Relative risk of upper gastrointestinal complications among users of acetaminophen and nonsteroidal anti-inflammatory drugs</style><style face="normal" font="default" size="100%">Relative risk of upper gastrointestinal complications among users of acetaminophen and nonsteroidal anti-inflammatory drugs</style>