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APA Citation
Messmann, H., Endlicher, E., Freunek, G., Rümmele, P., Schölmerich, J., & Knüchel, R. (n.d.). fluorescence endoscopy for the detection of low and high grade dysplasia in ulcerative colitis using systemic or local 5-aminolaevulinic acid sensitisation. Gut, 52, 1003–1007. http://access.bl.uk/ark:/81055/vdc_100137783612.0x000043