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APA Citation
Taha, A., McCloskey, C., Craigen, T., Simpson, A., & Angerson, W. (n.d.). pTU-021 Occult vs. overt upper gastrointestinal bleeding – inverse relationship and the use of mucosal damaging and protective drugs. Gut, 64, A67. http://access.bl.uk/ark:/81055/vdc_100137787690.0x00004f