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APA Citation
Leidenius, M., Kellokumpu, I., Husa, A., Riihelä, M., & Sipponen, P. (1991). dysplasia and carcinoma in longstanding ulcerative colitis: an endoscopic and histological surveillance programme.. Gut, 32(12), 1521–1525. http://access.bl.uk/ark:/81055/vdc_100135149243.0x00004a