Intravenous Dihydroergotamine for Inpatient Management of Refractory Primary Headaches
Neurol 77:1827-1832, Nagy, A.J.,et al, 2011
Analgesic Use: A Predictor of Chronic Pain and Medication Overuse Headache
Neurol 61:160-164,154, Zwart,J.-A.,et al, 2003