1. Institute of Fluid Science Tohoku University Sendai Japan
2. Department of Biomedical Sciences, Faculty of Medicine, Health and Human Sciences Macquarie University Sydney New South Wales Australia
3. Department of Neurosurgery Tohoku University Graduate School of Medicine Sendai Japan
4. Department of Neuroanesthesia Kohnan Hospital Sendai Japan
5. Department of Neuroendovascular Therapy Kohnan Hospital Sendai Japan