Accuracy of ICD-9-CM codes for upper gastrointestinal complications varied by position and age: a validation study in a cohort of NSAIDs users in Friuli Venezia Giulia, Italy.

Pisa, F., Castellsague, J., Drigo, D., Riera Guardia, N., Giangreco, M., Rosolen, M., Clagnan, E., Zanier, L., Perez-Gutthann, S., & Barbone, F. (2013). Accuracy of ICD-9-CM codes for upper gastrointestinal complications varied by position and age: a validation study in a cohort of NSAIDs users in Friuli Venezia Giulia, Italy. Pharmacoepidemiology and Drug Safety, Epub ahead of print, 0 - 0.

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