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Epstein, B.S., Matzner, M.J. A technique for radiographic identification of a lesion seen in the recto-sigmoid with the help of the sigmoidoscope. American Journal of Digestive Diseases 7, 179–180 (1940). https://doi.org/10.1007/BF02997173
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DOI: https://doi.org/10.1007/BF02997173