1. Department of Neurology, Fuji City General Hospital, Japan
2. Department of Neurology, The Jikei University School of Medicine, Japan
3. Department of Neurology, Nippon Medical School, Japan
4. Department of Medical Statistics, Toho University, Japan
5. Department of Stroke Medicine, Institute of Brain and Blood Vessels, Mihara Memorial Hospital, Japan
6. Department of Neurology, Juntendo University School of Medicine, Japan
7. Stroke Center and Division of Neurology, Department of Medicine, Jichi Medical University, Japan
8. Department of Cerebrovascular Medicine, NTT Medical Center Tokyo, Japan