1. Department of Neurosurgery, Hannover Medical School, Hannover, Germany (Capelle, Krauss)
2. Department of Neurology, University Hospital, Klinikum Mannheim, Mannheim, Germany (Grips, Blahak, Hansjörg, Wohrle)
3. Department of Neurosurgery, University Hospital, Klinikum Mannheim, Mannheim, Germany (Weigel)