1. Bioelectronics,
The Pollard Institute, School of Electronic and Electrical Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom
2. Institute
for Integrated Cell-Material Sciences, Kyoto University, Yoshida-ushinomiyacho, Sakyo-ku, Kyoto 606-8501, Japan
3. Department
of Physics and Astronomy, University of Sheffield, Houndsfield
Road, Sheffield S3 7RH, United Kingdom