Researchers at Rush University Medical Center are testing a new treatment for migraine headaches: occipital nerve stimulation, a surgical procedure in which an implanted neurostimulator delivers electrical impulses to nerves under the skin at the base of the head at the back of the neck. This therapy may help migraine sufferers who do not respond to other available therapies, or who cannot tolerate the side effects of existing medications. "The purpose of the randomized, double-blinded study i