1. Frontier Research Institute of Interdisciplinary Sciences, Tohoku University, Sendai, Japan
2. Institute of Fluid Science, Tohoku University, Sendai, Japan
3. Graduate School of Engineering, Tohoku University, Sendai, Japan
4. Department of Neurosurgery, Kohnan Hospital, Sendai, Japan
5. Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan
6. Department of Neuroendovascular Therapy, Kohnan Hospital, Sendai, Japan