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: 10.1016/S0016-5107(05)00841-2 Copyright © 2005 American Society for Gastrointestinal Endoscopy Terms and Conditions
Gastrointestinal Endoscopy 2005 61, DOI: (10 Gastrointestinal Endoscopy 2005 61, DOI: (10.1016/S0016-5107(05)00841-2) Copyright © 2005 American Society for Gastrointestinal Endoscopy Terms and Conditions