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Previous Volume 354:884 February 23, 2006 Number 8

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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Chronic Daily Headache . On page 160, in Table 2, the male:female ratio for cluster headache should have read "3:1," rather than "1:3," as printed. Also, on page 217, in the Continuing Medical Education section, choice A under Question 1 (which was listed as an incorrect choice) should have read, "Cluster headaches are more common among women than among men," rather than "more common among men than among women," as printed. Likewise, the explanation that followed the choices, which appeared at www.nejm.org, should have read, "Cluster headache is more common among men," rather than "among women," as printed. This article . . . [Full Text of this Article]

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