1. Department of Biomechanical Engineering, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Mekelweg 2, Delft 2628 CD, The Netherlands e-mail:
2. Department of Microelectronics, Delft University of Technology, Delft 2628 CD, The Netherlands
3. Faculty of Mechanical, Maritime and Materials Engineering, Department of Biomechanical Engineering, Delft University of Technology, Mekelweg 2, Delft 2628 CD, The Netherlands
4. Department of Biomedical Engineering and Physics, University of Amsterdam, Meibergdreef 9, Amsterdam 1105 AZ, The Netherlands