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Eller, Michael; Gelfand, Amy A; Riggins, Nina Y; Shiboski, Stephen; Schankin, Christoph; Goadsby, Peter J (2016). Exacerbation of headache during dihydroergotamine for chronic migraine does not alter outcome. Neurology, 86(9), pp. 856-859. Lippincott Williams & Wilkins 10.1212/WNL.0000000000002406