1. From the Department of Neurology, EvKB-Bethel, Bielefeld, Germany (W.-R.S.)
2. University of Münster, Germany (W.-R.S.)
3. Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA (M.F.)
4. Department of Neurology, University of Texas Health Science Center, McGovern Medical School, Houston (J.A.).