1. Institute of Anatomy; University of Leipzig; Oststr. 25 04317 Leipzig Germany
2. Leibniz Institute for Surface Modification (IOM) e.V.; Permoser Str. 15 04318 Leipzig Germany
3. Division of Surface Physics; Department of Physics and Earth Sciences; University of Leipzig; 04103 Leipzig Germany
4. Soft Matter Physics Division; Institute for Experimental Physics 1; University of Leipzig; Linnéstr. 5 04103 Leipzig Germany