Hewamadduma C A A, Kirby J, Kershaw C, Martindale J, Dalton A, McDermott C J, Shaw P J
Academic Neurology Unit, Medical School, Beech Hill Road, University of Sheffield, S10 2RX, UK.
Neurology. 2008 May 6;70(19):1717-8. doi: 10.1212/01.wnl.0000311395.31081.70.