1. Department of Neurosurgery, Kosei Hospital, Kobe, Hyogo, Japan
2. Department of Anesthesiology, Kosei Hospital, Kobe, Hyogo, Japan
3. Department of Clinical Engineering, Kosei Hospital, Kobe, Hyogo, Japan
4. Department of Radiological Technology, Kosei Hospital, Kobe, Hyogo, Japan
5. Department of Neuroendovascular Therapy, Kohnan Hospital, Sendai, Miyagi, Japan
6. Department of Neurosurgery, Kobe University Hospital, Kobe, Hyogo, Japan