1. Graduate School of Dentistry; Tohoku University; Sendai 980-8575 Japan
2. Graduate School of Biomedical Engineering; Tohoku University; Sendai 980-8579 Japan
3. School of Chemistry and Chemical Engineering; Guangxi University; Nanning 530004 China
4. Graduate School of Life Science and Systems Engineering; Kyushu Institute of Technology; Kitakyushu 808-0196 Japan