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Title
Should chronic migraine be defined by eight or more headache days per month?
Abstract
An editorial is presented on the chronic migraine defined by eight or more headache days per month. The article discusses that the American Migraine Foundation and American Headache Society for developing the American Registry for Migraine Research (ARMR); and research coordinators who participated in ARMR; and study used ARMR data to investigate migraine burden according to headache frequency.