1. Department of Neurology, Medical University of Vienna, Vienna, Austria
2. Department of Psychiatry and Psychotherapy, University of Tuebingen, Tuebingen, Germany
3. Institute of Medical Psychology and Behavioural Neurobiology, University of Tuebingen, Tuebingen, Germany
4. Department of Neurology, Vivantes Klinikum im Friedrichshain, Berlin, Germany