1. Department of Biomedical Engineering; Michigan Technological University; 1400 Townsend Dr. Houghton MI 49931 USA
2. Department of Materials Science and Engineering; Michigan Technological University; 1400 Townsend Dr. Houghton MI 49931 USA
3. Department of Otorhinolaryngology; Hannover Medical School; Carl-Neuberg-Str. 1 30625 Hannover Germany