1. Institute for Clinical Neurobiology University Hospital of Würzburg Versbacherstr. 5 D‐97078 Würzburg Germany
2. Biopolymer Processing Group University of Bayreuth Ludwig‐Thoma‐Str. 36A D‐95447 Bayreuth Germany
3. Chair of Biomaterials University of Bayreuth Prof.‐Rüdiger‐Bormann‐Str. 1 D‐95447 Bayreuth Germany
4. Department for Functional Materials in Medicine and Dentistry University Hospital of Würzburg Pleicherwall 2 D‐97070 Würzburg Germany
5. Department of Materials Science and Engineering Chair of Polymer Materials University of Erlangen‐Nuremberg Martensstr. 7 D‐91058 Erlangen Germany