Cluster HeadacheBMJ 344:e2407, Nesbitt,A.D.,et al, 2012
The Emergency Management of HeadachesThe Neurologist 9:93-98, Green,M.W., 2003
Cerebral Vasoconstriction and Stroke After Use of Serotonergic DrugsNeurol 58:130-133, Singhal,A.B.,et al, 2002