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APA Citation
Smedley, F. H., Taube, M., Leach, R., & Wastell, C. (1989). non-steroidal anti-inflammatory drug ingestion: retrospective study of 272 bleeding or perforated peptic ulcers.. Postgraduate medical journal, 65(770), 892–895. http://access.bl.uk/ark:/81055/vdc_100135572572.0x000039