1. Department of Microtechnology and Nanoscience–MC2, Chalmers University of Technology, Göteborg 412 96, Sweden
2. RISE Acreo AB, SE-411 33 Göteborg, Sweden
3. Department of Engineering Sciences, Uppsala University, The Ångström Laboratory, Box 534, SE-751 21 Uppsala, Sweden
4. Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg 412 96, Sweden
5. MedTech West and the Institute of Neuroscience and Physiology, University of Gothenburg, SE-40530 Göteborg, Sweden