1. Department of Neuroendovascular Therapy, JCHO Tokyo Shinjuku Medical Center, Tokyo, Japan
2. Department of Neurosurgery, JCHO Tokyo Shinjuku Medical Center, Tokyo, Japan
3. Department of Neuroendovascular Therapy, Mito Brain Heart Center, Mito, Ibaraki, Japan
4. Physiological Laboratory, JCHO Tokyo Shinjuku Medical Center, Tokyo, Japan