1. Department of Neurology, National Cerebral and Cardiovascular Center , Osaka 5648565 , Japan
2. Department of Neurology, Graduate School of Medical Sciences, Kumamoto University , Kumamoto 8608556 , Japan
3. Department of Neurology, Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology , Tokyo 1730015 , Japan
4. Department of Neurology, Nakamura Memorial Hospital , Sapporo 0608570 , Japan
5. Clinic of Minami-ichijyo Neurology , Sapporo 0600061 , Japan
6. Department of Neurology, Kobe City Medical Center General Hospital , Kobe 6500047 , Japan
7. Department of Neurology, St Mary’s Hospital , Fukuoka 8300047 , Japan
8. Department of Neurology, National Hospital Organization Okayama Medical Center , Okayama 7011192 , Japan
9. Department of Neurology, Toyota Memorial Hospital , Toyota 4718513 , Japan
10. Department of Neurology, Kyoto University Graduate School of Medicine , Kyoto 6068507 , Japan
11. Department of Preventive Medicine and Epidemiology, National Cerebral and Cardiovascular Center , Osaka 5648565 , Japan
12. Department of Cerebrovascular Medicine, National Cerebral and Cardiovascular Center , Osaka 5648565 , Japan
13. Division of Neurology, Kobe University Graduate School of Medicine , Kobe 6500017 , Japan
14. Department of Epilepsy, Movement Disorders and Physiology, Kyoto University Graduate School of Medicine , Kyoto 6068507 , Japan