1. Department of Otorhinolaryngology; Hannover Medical School; Hannover 30625 Germany
2. Department of Orthopedic Surgery; CrossBIT-Center of Biocompatibility and Implant-Immunology, Hannover Medical School; Hannover 30625 Germany
3. Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover; Hannover 30823 Germany
4. Department of Materials Science and Engineering; Michigan Technological University; Houghton Michigan 49931
5. Department of Biomedical Engineering; Michigan Technological University; Houghton Michigan 49931