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APA Citation
Freeman, T. C., Playford, R. J., Quinn, C., Beardshall, K., Poulter, L., Young, J., & Calam, J. (1990). pancreatic secretory trypsin inhibitor in gastrointestinal mucosa and gastric juice.. Gut, 31(11), 1318–1323. http://access.bl.uk/ark:/81055/vdc_100135535930.0x00004b