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This page is a summary of: Accuracy of International Classification of Diseases, 9th Revision, Clinical Modification codes for upper gastrointestinal complications varied by position and age: a validation study in a cohort of nonsteroidal anti‐inflammatory drugs users in Friuli ..., Pharmacoepidemiology and Drug Safety, August 2013, Wiley,
DOI: 10.1002/pds.3504.
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