1. Graduate School of Engineering, Hiroshima University,Department of System Cybernetics,Hiroshima,Japan
2. Graduate School of Advanced Science and Engineering, Hiroshima University,Hiroshima,Japan
3. Junshin Gakuen University,Faculty of Health Sciences,Department of Medical Engineering,Fukuoka,Japan
4. Hiroshima University Hospital,Department of Cardiovascular Surgery,Hiroshima,Japan