1. Department of Neurology, University Hospital Zurich, Zurich, Switzerland.
2. Institute of Neuroradiology, University Hospital Zurich, Zurich, Switzerland.
3. Institute for Biomedical Engineering, University & ETH Zurich, Zurich, Switzerland.
4. Spinal Cord Injury Center, University Hospital Balgrist, Zurich, Switzerland.
5. Division of Biostatistics, Institute of Social and Preventive Medicine, University of Zurich, Zurich, Switzerland.