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The letter from Dr. S. G. Sandler published in the Comments section of the March issue (Ann Intern Med 80:423, 1974) contained a typographical error that changed the beginning date of the study cited in line 4, from the correct date of July 1969 to July 1961.
Correction: Erroneous Date of Research. Ann Intern Med. ;81:417. doi: 10.7326/0003-4819-81-3-417_2
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Published: Ann Intern Med. 1974;81(3):417.
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