1. Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Cologne, Cologne, Germany
2. Department of Psychiatry and Psychotherapy, Faculty of Medicine, Technical University of Dresden, Dresden, 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, Charité Universitätsmedizin Berlin, Berlin, Germany