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In the book review entitled "Ulcerative Colitis" by Robert S. Nelson, MD, which appeared in the October issue (Arch Intern Med128:644-645, 1971), an error appeared on page 644. The second sentence should read "Its etiology is not known...."
ERRATUM. Arch Intern Med. 1971;128(6):1000. doi:10.1001/archinte.1971.00310240154037
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