1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St Gallen, Switzerland
2. Department of Information Technology and Electrical Engineering, ETH Zurich, Swiss Federal Institute of Technology, Gloriastrasse 35, 8092 Zurich, Switzerland
3. CSEM, Swiss Center for Electronics and Microtechnology, Rue Jaquet-Droz 1, 2002 Neuchâtel, Switzerland
4. Swiss Paraplegic Center, Guido A. Zäch Strasse 1, 6207 Nottwil, Switzerland
5. Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, Frauenklinikstrasse 10, 8091 Zurich, Switzerland