1. INM-Leibniz Institute for New Materials, 66123 Saarbrücken, Germany
2. Center of Experimental and Applied Cutaneous Physiology (CCP), Department of Dermatology, Venereology and Allergology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt Universität zu Berlin, Charitéplatz 1, 10117 Berlin, Germany
3. Department of Physics, Saarland University, 66123 Saarbrücken, Germany