1. MIRA
Institute for Biomedical Technology and Technical Medicine and Department
of Biomaterials Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
2. W.
J. Kolff Institute, Department of Biomedical Engineering, University of Groningen, University Medical Centre Groningen, P.O. Box 196, 9700 AD Groningen, The Netherlands