1. Institute of Applied Medical Engineering, Helmholtz Institute, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
2. Institute of Pathology, Electron Microscopy Facility, University Clinic Aachen, 52074 Aachen, Germany
3. DWI—Leibniz-Institute for Interactive Materials, 52074 Aachen, Germany
4. Aachen-Maastricht Institute for Biobased Materials, Faculty of Science and Engineering, Maastricht University, 6167 RD Geleen, The Netherlands
5. Department of Pneumology and Internal Intensive Care Medicine, Medical Clinic V, University Clinic Aachen, 52074 Aachen, Germany