Kranick Sarah M, Price Raymond S, Prasad Sashank, Hurtig Howard I
Department of Neurology, Hospital of the University of Pennsylvania, 3 West Gates Bldg., 3400 Spruce St., Philadelphia, PA 19104, USA.
Neurology. 2008 Nov 11;71(20):e59-62. doi: 10.1212/01.wnl.0000334759.72146.39.