1. Institute for Biomedical Technology (BMTI) and Department of Polymer Chemistry and Biomaterials, Faculty of Science and Technology, University of Twente, Post Office Box 217, 7500 AE, Enschede, The Netherlands, Department of Pathology and Laboratory Medicine, Medical Biology Section, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ, Groningen, The Netherlands, and Department of Biomedical Engineering, University Medical Center Groningen, University of Groningen, A....