1. Department of Traditional Asian Medicine, Graduate School of Medicine, Tohoku University, Sendai 980-8575, Japan
2. School of Engineering, Tohoku University, Sendai 980-8579, Japan
3. Institute of Fluid Science, Tohoku University, Sendai 980-0812, Japan
4. Department of Geriatrics and Gerontology, Institute of Development, Aging and Cancer, Tohoku University, Sendai 980-0872, Japan
5. Department of Medical Engineering and Cardiology, Institute of Development, Aging and Cancer, Tohoku University, Sendai 980-0872, Japan