Farooq Muhammad U, Samaraweera Ranji, Heilman Timothy, Chang Howard T
Department of Neurology and Ophthalmology, A-217 Clinical Center, Michigan State University, East Lansing, MI 48824, USA.
Arch Neurol. 2008 Jul;65(7):981-2. doi: 10.1001/archneur.65.7.981.