1. Functional Nanomaterials, Institute for Materials Science, Faculty of Engineering, Kiel University, Kaiserstr. 2, D-24143 Kiel, Germany
2. Phi-Stone AG, Kaiserstr. 2, D-24143 Kiel, Germany
3. Institute for Molecular Systems Engineering and Advanced Materials (IMSEAM), Heidelberg University, INF 225, D-69120 Heidelberg, Germany
4. Mads Clausen Institute, NanoSYD, University of Southern Denmark, DK-6400 Sønderborg, Denmark
5. Department of Ophthalmology, University of Lübeck, University Clinic Schleswig-Holstein, Ratzeburger Allee 160, D-23538 Lübeck, Germany