1. Institute for Implant Technology and Biomaterials e.V., Rostock- Warnemünde , Germany
2. Institute for Biomedical Engineering, University Medical Center Rostock, Rostock , Germany
3. Department of Surgery, University Medical Center Rostock, Rostock , Germany
4. Department of Otolaryngology, Hannover Medical University, Hanover , Lower Saxony, Germany
5. Clinic and Polyclinic for Gynaecology and Obstetrics, University Medical Center Greifswald, Greifswald , Germany