1. Division of Neurology; Hyogo Prefectural Amagasaki General Medical Center; 2-17-77 East-Naniwa Amagasaki City Hyogo 660-8550 Japan
2. Department of Neurology; Kobe University Graduate School of Medicine; Kobe Japan
3. Department of Neurology; National Hospital Organization Minami Kyoto Hospital; Kyoto Japan
4. Department of Neurology and Geriatrics; Kagoshima University Graduate School of Medical and Dental Sciences; Kagoshima Japan