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Title of the paper presented at the workshops of the 66th annual meeting of the Japanese Society of Gastroenterology, March 30 to to April 1, 1980, Tokyo, Japan. Gastroenterol Jpn 16, 393–396 (1981). https://doi.org/10.1007/BF02774474
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DOI: https://doi.org/10.1007/BF02774474