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MLA Citation
Federica Pisa et al.. “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 Venezia Giulia, Italy1.” Pharmacoepidemiology and drug safety, vol. 22, n.d., pp. 1195–1204. http://access.bl.uk/ark:/81055/vdc_100044731675.0x000001