1. Institute of Nano-
and Biotechnologies, FH Aachen, Campus Jülich, 52428 Jülich, Germany
2. Peter Grünberg Institute (PGI-8), Research Centre Jülich GmbH, 52425 Jülich, Germany
3. Biosensor National Special Laboratory, Key Laboratory
for Biomedical Engineering of Ministry of Education, Department of
Biomedical Engineering, Zhejiang University, Hangzhou 310027, China
4. Institute of Pharmaceutical Chemistry, Philipps University Marburg, 35032 Marburg, Germany
5. Institute of Measurement and Automatic Control, Leibniz University Hannover, 30167 Hannover, Germany