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Akiyama, H., Aso, K., Shima, F. et al. Macroscopic classification of the cancer of the esophagus and its alteration after irradiation. Gastroenterol Jpn 3, 276 (1968). https://doi.org/10.1007/BF02777429
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DOI: https://doi.org/10.1007/BF02777429