1. Faculty of Engineering ScienceDepartment of BiofabricationUniversity of Bayreuth Ludwig Thoma Str. 36A 95447 Bayreuth Germany
2. College of Materials Science and EngineeringGuilin University of Technology Jiangan Str. 12 541004 Guilin China
3. Bavarian Polymer Institute Universitätsstr. 30 95440 Bayreuth Germany