Cluster Headache
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Intravenous Dihydroergotamine for Inpatient Management of Refractory Primary Headaches
Neurol 77:1827-1832, Nagy, A.J.,et al, 2011
Verapamil Induced Gingival Enlargement in Cluster Headache
JNNP 76:124-127, Matharu,M.S.,et al, 2005