1. Department of Plastic and Hand Surgery; Faculty of Medicine, Medical Center-University of Freiburg, Freiburg; Germany
2. Laboratory for MEMS Applications, IMTEK-Department of Microsystems Engineering; University of Freiburg, Georges-Koehler-Allee 103; Freiburg 79110 Germany
3. Hahn-Schickard, Georges-Koehler-Allee 103; Freiburg 79110 Germany
4. FIT-Freiburg Centre for Interactive Materials and Bioinspired Technologies; University of Freiburg, Georges-Koehler-Allee 105; Freiburg 79110 Germany