Kumar N, Sandroni P, Steensma D P, Luthra H S, Habermann T M
Dept. of Neurology, Mayo Clinic Bldg E-8 A, Mayo Clinic Rochester, 200 First Street SW, Rochester, MN 55905, USA.
Neurology. 2008 Nov 11;71(20):1644-5. doi: 10.1212/01.wnl.0000334757.16882.37.