1. National Engineering
Research
Center for Biomaterials, Sichuan University, 610064 Chengdu, China
2. Peter Grünberg Institute
(PGI-8), Research Center Jülich,
52425 Jülich, Germany
3. Institute of Complex Systems (ICS-6), Research Center Jülich, 52425 Jülich,
Germany
4. Institute of Physical Biology, Heinrich-Heine-University, Düsseldorf, Germany
5. State Key Laboratory
of Functional
Materials for Informatics, Shanghai Institute of Microsystem and Information
Technology, Chinese Academy of Sciences, 200050 Shanghai, China