1. Department of Neurosurgery, Juntendo University School of Medicine, Tokyo, Japan
2. Department of Neurology, Juntendo University Urayasu Hospital, 2-1-1 Tomioka, Urayasu, Chiba 279-0021, Japan
3. Department of Neurology, Juntendo University School of Medicine, Tokyo, Japan
4. Department of Clinical Laboratory, Faculty of Medicine, The University of Tokyo, Tokyo, Japan
5. Department of Neuroendovascular Therapy, Juntendo University School of Medicine, Tokyo, Japan