1. Department of Neuroendovascular Therapy and Neurosurgery, Juntendo University Faculty of Medicine, Bunkyo-ku, Tokyo, Japan.
2. Department of Neuroendovascular Therapy, Juntendo University Faculty of Medicine, Bunkyo-ku, Tokyo, Japan.
3. Department of Neurosurgery, Juntendo University Faculty of Medicine, Bunkyo-ku, Tokyo, Japan.