1. Department of Neurology; Hanamaki General Hospital; 4-28 Kajoh-chou Hanamaki 025-0075 Japan
2. Department of Neurology; Keio University School of Medicine; Shinjuku-ku Tokyo Japan
3. Department of Neurology; Tokyo Medical University; Tokyo Japan
4. Department of Neurology; Iizuka Hospital; Iizuka Japan
5. Department of Neurology; Sapporo Medical University Hospital; Sapporo Japan
6. Department of Neurology; Toho University Medical Center Oh-hashi Hospital; Tokyo Japan
7. Department of Neurology; Nagasaki Kawatana Medical Center; Higashi-Sonogi-Gun Japan
8. Department of Neurology; Sendai Medical Center; Sendai Japan
9. Department of Neurology; Tohoku University Graduate School of Medicine; Sendai Japan