From the Lightning Data Center, St. Anthony Hospital (M.C., P.R.Y., J.L., L.A., G.L.), Departments of Neurology (M.C., P.Y.R.) and Neurosurgery (P.R.Y.), University of Colorado School of Medicine, Denver, Head Pain Center, Colorado Neurological Institute (J.L.), Englewood, and the Power Specialists Company (G.L.), Kittredge, Colorado.
Submitted for publication January 24, 2001.
Accepted for publication August 8, 2001.
Address for reprints: Michael Cherington, MD, Lightning Data Center, St. Anthony Hospital, 4231 West 16th Avenue, Denver, CO 80204.