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APA Citation
Ell, C., Gossner, L., May, A., Schneider, H. T., Hahn, E. G., Stolte, M., & Sroka, R. (1998). photodynamic ablation of early cancers of the stomach by means of mTHPC and laser irradiation: preliminary clinical experience. Gut, 43(3), 345–349. http://access.bl.uk/ark:/81055/vdc_100135136922.0x00004d