1. Institute for Technical Medicine, Hochschule Furtwangen University, 78056 Schwenningen, Germany
2. BIROMED-Lab, Department of Biomedical Engineering, University of Basel, 4123 Allschwil, Switzerland
3. Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany
4. Center for Bioengineering, Department of Mechanical Engineering, University of Canterbury, Christchurch 8041, New Zealand