Willey Joshua Z, Claassen Jan, Liberato Bernardo, Prabhakaran Shyam
Department of Neurology, Neurological Institute, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA.
Cerebrovasc Dis. 2006;21(3):210-2. doi: 10.1159/000090794. Epub 2006 Jan 9.