1. Macromolecular Chemistry, Department of Chemistry and Biology, University of Siegen, Adolf Reichwein-Straße 2, 57074 Siegen, Germany
2. Biosensor Technologies, AIT-Austrian Institute of Technology GmbH, Konrad-Lorenz-Straße 24, 3430 Tulln an der Donau, Austria
3. CEST Competence Center for Electrochemical Surface Technologies, 3430 Tulln an der Donau, Austria
4. FZU-Institute of Physics, Czech Academy of Sciences, Na Slovance 2, Prague 182 21, Czech Republic