1. Department of Thoracic; Transplant and Cardiovascular Surgery; Hannover Medical School; 30625 Hannover Germany
2. Department of Nanotechnology; Laser Zentrum Hannover e.V.; D-30419 Hannover Germany
3. University of Duisburg-Essen; Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE); D-45141 Essen Germany
4. University of Duisburg-Essen; Physical Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE); D-45141 Essen Germany