1. Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu, Tokyo, Japan;
2. Graduate School of System Design, Tokyo Metropolitan University, Hino, Tokyo, Japan;
3. Division of Bioengineering, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan;
4. Department of Intensive Care Medicine, National Defense Medical College, Tokorozawa, Saitama, Japan;
5. Department of Measurement and Control Technology and Communication Engineering, The Harbin University of Science and Technology, Harbin, China