1. Clinical Physiology Center, Tohoku University Hospital, Sendai, Miyagi, Japan
2. Department of Vascular Surgery, South Miyagi Medical Center, Ogawara, Miyagi, Japan
3. Department of Clinical Practice and Support, Hiroshima University Hospital, Hiroshima, Hiroshima, Japan
4. Graduate School of Biomedical Engineering, Tohoku University, Sendai, Miyagi, Japan