1. Department of Polymer Chemistry and Biomaterials; Institute for Biomedical Technology and Technical Medicine (MIRA); University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
2. Department of Biomaterials Science and Technology; Institute for Biomedical Technology and Technical Medicine (MIRA); University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
3. Department of Biomedical Engineering; University Medical Centre Groningen; University of Groningen; P.O. Box 196 9700 AD Groningen The Netherlands