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terms and results are available upon request. International headache and neurology guidelines, as well as headache policies from the U.S. Air Force (USAF), were also reviewed. Each topic is summarized separately in the following sections. RESULTS Diagnosis and Differential Diagnosis of Migraine Migraines are a type of primary headache disorder defined by the International Headache Society as a headache lasting for 4 to 72 h, with at least two of the following characteristics: unilateral location, pulsating quality, moderate or severe pain intensity, and