1. Spinal Cord Injury Center, Heidelberg University Hospital, Heidelberg, Germany.
2. Department of Neuroradiology, Heidelberg University Hospital, Heidelberg, Germany.
3. Department of Neurology, Kantonsspital Lucerne, Lucerne, Switzerland.
4. Department of Neurology, Inselspital Bern, University of Bern, Bern, Switzerland.
5. Regensburg, Germany.
6. Institute of Diagnostic and Interventional Radiology, Pediatric Radiology and Neuroradiology, Rostock University Medical Center, Rostock, Germany.