1. Global Center for Medical Engineering and Informatics, Osaka University, Suita, Osaka 565-0871, Japan
2. Institute of Low Temperature Science, Hokkaido University, Sapporo 060-8638, Japan
3. Institute of Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
4. Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan