1. Institute of Active Polymers, Helmholtz-Zentrum Geesthacht, Kantstr. 55, 14513 Teltow, Germany
2. Joint Laboratory for Biomaterials and Regenerative Medicine, Tianjin University−Helmholtz-Zentrum Geesthacht, Kantstr. 55, 14513 Teltow, Germany
3. Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam, Germany