1Headache Centre, Section of Neurology, Department of Neuroscience, University of Parma, I-43100 Parma, Italy. manzoni@ipruniv.cce.unipr.it
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The International Classification of Headache Disorders 2nd Edition (ICHD-II) offers progress but needs refinement. It inadequately classifies chronic migraine and certain headache syndromes, requiring further clinical validation.
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