Fife T D, Iverson D J, Lempert T, Furman J M, Baloh R W, Tusa R J, Hain T C, Herdman S, Morrow M J, Gronseth G S
Barrow Neurological Institute and University of Arizona College of Medicine, Phoenix, AZ, USA
Neurology. 2008 May 27;70(22):2067-74. doi: 10.1212/01.wnl.0000313378.77444.ac.