Cluster Headache
BMJ 344:e2407, Nesbitt,A.D.,et al, 2012
The Neurosurgical Treatment of Pain
Arch Neurol 60:1537-1540, Giller,C.A., 2003
Treatments of Parkinson Disease
Arch Neurol 60:1680-1684, Shults,C.W., 2003
Parkinson's Disease
JNNP 57:672-681, Marsden,C.D., 1994