1. Department of Neurology, Dresden University of Technology, Dresden, Germany.
2. Center for Regenerative Therapies Dresden, Dresden, Germany.
3. Institute for Medical Physics and Biophysics, University of Leipzig, Leipzig, Germany.
4. Department of Neuroradiology, Institute of Radiology, Dresden University of Technology, Dresden, Germany.
5. Department of Neurosurgery, Dresden University of Technology, Dresden, Germany.
6. Department of Neurology, University of Leipzig, Leipzig, Germany.
7. Division of Biophysics, California Institute of Technology, Pasadena, California.