1. Department of Neurology; Keio University School of Medicine; Tokyo Japan
2. Department of Cardiology; Kitasato Institute Hospital; Kitasato University; Tokyo Japan
3. Division of Neurology; Department of Internal Medicine 3; National Defense Medical College; Saitama Japan
4. Department of Neurology; Hanamaki General Hospital; Iwate Japan
5. Neurology Service; Hyogo Brain and Heart Center at Himeji; Hyogo Japan
6. Department of Neurology; Fukuoka University School of Medicine; Fukuoka Japan
7. Division of Rheumatology; Department of Internal Medicine; Keio University School of Medicine; Tokyo Japan