1. Department of Neurology; Tohoku University Graduate School of Medicine; Sendai; Japan
2. Center for Brain Research; Medical University Vienna; Vienna; Austria
3. Department of Neurology; Tohoku Welfare Pension Hospital; Sendai; Japan
4. Department of Neurology; National Hospital Organization Sendai Medical Center; Sendai; Japan
5. Department of Neurology; Kohnan Hospital; Sendai; Japan
6. National Center Hosptial; National Center of Neurology and Psychiatry; Tokyo; Japan