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APA Citation
Fotis, D., Doukas, M., Wijnhoven, B. P., Didden, P., Biermann, K., Bruno, M. J., & Koch, A. D. (n.d.). submucosal invasion and risk of lymph node invasion in early Barrett's cancer: potential impact of different classification systems on patient management. United European Gastroenterology journal, 3(6), 505–513. http://access.bl.uk/ark:/81055/vdc_100124787802.0x00000c