1. Gastrointestinal Endoscopy
Validation of ICD-9 Codes Used for the Diagnosis of Upper Gastrointestinal Events (UGIE) Following NSAID Prescription 
Neena S. Abraham, Brian Rivers, Peter Richardson, Michael Johnson, Hashem El-Serag 
Gastrointestinal Endoscopy 
Volume 61, Issue 5, (April 2005)
DOI: /S (05)
Copyright © 2005 American Society for Gastrointestinal Endoscopy Terms and Conditions

2. Gastrointestinal Endoscopy 2005 61, DOI: (10
Gastrointestinal Endoscopy  , DOI: ( /S (05) )
Copyright © 2005 American Society for Gastrointestinal Endoscopy Terms and Conditions