1. Biomaterials Department , INNOVENT e.V. , Prüssingstrasse 27B, D-07745 Jena , Germany
2. Institute for Medical Physics and Biophysics, Medical Faculty, Universität Leipzig , D-04107 Leipzig , Germany
3. Institute of Materials Science, Max Bergmann Center of Biomaterials, TU Dresden , Budapester Str. 27, D-01069 Dresden , Germany