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Read at the meeting of the American Proctologic Society, New York, New York, June 11 to 14, 1972.
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Welin, S., Welin, G. A pathognomonic roentgenologic sign of regional ileitis (Crohn's disease). Dis Colon Rectum 16, 473–478 (1973). https://doi.org/10.1007/BF02588871
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DOI: https://doi.org/10.1007/BF02588871