1. Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Biomaterials, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland, Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Functional Polymers, Überlandstr. 129, CH-8600 Dübendorf, Switzerland, and ETHZ, Swiss Federal Institute of Technology, Institute of Biotechnology, ETH Zürich, CH-8093 Zürich, Switzerland