1. Department of Plastic and Hand Surgery, University Hospital of Erlangen, Friedrich-Alexander University of Erlangen-Nürnberg, Erlangen, Germany.
2. Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander University of Erlangen-Nürnberg, Erlangen, Germany.
3. Department for Materials Research and Nanostructures, Institute for Physics, University of Rostock, Rostock, Germany.