1. Department of Neurosurgery, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany;
2. Departments of Neurosurgery and
3. Psychology, Central General Hospital, Bozen;
4. Department of Neurosurgery, San Giovanni Addolorata Hospital, Rome, Italy and
5. Department of Neurosurgery, Bern Inselspital Hospital, University of Bern, Switzerland