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April L. Perry Carson, Kathryn M. Rose, Catherine P. Sanford, Sara A. Ephross, Paul E. Stang, Kelly J. Hunt, C. Andrew Brown, Moyses Szklo. Lifetime Prevalence of Migraine and Other Headaches Lasting 4 or More Hours: The Atherosclerosis Risk in Communities (ARIC) Study. Headache. 2004;44:20-28.

This article incorrectly cited the name of Ms. Carson. The correct citation should read:

April Perry Carson, Kathryn M. Rose, Catherine P. Sanford, Sara A. Ephross, Paul E. Stang, Kelly J. Hunt, C. Andrew Brown, Moyses Szklo. Lifetime Prevalence of Migraine and Other Headaches Lasting 4 or More Hours: The Atherosclerosis Risk in Communities (ARIC) Study. Headache. 2004;44:20-28.

Paolo Rossi, Giorgio Di Lorenzo, Rita Formisano and M. Gabriella Buzzi. Subcutaneous Sumatriptan Induces Changes in Frequency Pattern in Cluster Headache Patients. Headache. 2004;44:713-718.

Dr. Buzzi's affiliation was incorrectly stated Dr. Buzzi is associated with IRCCS Fondazione Santa Lucia, Rome, Italy.