1. Department of Psychiatry and Psychotherapy, University of Cologne Medical School, Cologne, Germany
2. Charité University Medicine, St Hedwig-Krankenhaus, Clinic for Psychiatry and Psychotherapy, Berlin, Germany
3. Institute of Medical Biometry and Statistics, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany
4. Department of Psychiatry and Psychotherapy, University Hospital of Dresden, Dresden, Germany