1. Laboratory of Thermodynamics in Emerging Technologies, ETH Zurich, Sonneggstrasse 3, CH-8092 Zurich, Switzerland
2. Institute for Biomedical Engineering, University and ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
3. Department of Neuroradiology, Nuffield Department of Surgery, University of Oxford, John Radcliffe Hospital, Headley Way, Headington, Oxford OX3 9DU, UK
4. Institute for Biomedical Engineering, University and ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland