Please note the correct author affiliation for the following manuscript: Diamond S; Bigal ME; Silberstein S; Loder E; Reed M; Lipton RB. Patterns of diagnosis and acute and preventive treatment for migraine in the United States: Results from the American Migraine Prevalence and Prevention study. Headache. 2007;47:355-363. Dr. Diamond's author affiliation should read: Diamond Headache Clinic, Chicago, IL. For the Resident-Fellow section contribution from the July/August 2007 issue of Headache the correct citation should read: Dinnerstein E. Teaching case: Intractable cyclical headaches in an adolescent. Headache. 2007;47:1111-1113.
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A 2007 study studied this question.