Cluster Headache
BMJ 344:e2407, Nesbitt,A.D.,et al, 2012
Acute Therapy for Cluster Headache with Sumatriptan:Findings of a One-Year Long-Term Study
Neurol 51:980-911, Gobel,H.,et al, 1998
Calcium Channels & Calcium Channel Antagonists
Ann Neurol 21:317-330, Greenberg,D.A., 1987