1. The University of Electro-Communications,Department of Mechanical and Intelligent Systems,Tokyo,Japan
2. The University of Electro-Communications,Department of Computer and Network Engineering,Tokyo,Japan
3. Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology,Tokyo,Japan
4. The University of Tokyo,Graduate School of Engineering,Tokyo,Japan
5. Nihon University,Department of Gastroenterology and Hepatology,Tokyo,Japan