1. Department of Clinical Psychology and Psychotherapy, Philipps University, Marburg, Germany
2. Department of Clinical Psychology and Psychotherapy, University of Siegen, Siegen, Germany
3. Department for Human Resources/Health/Social Sciences, Fachhochschule des Mittelstands (University of Applied Sciences) Bielefeld, Bielefeld, Germany
4. Department of Psychology, Clinical Psychology and Psychotherapy, Medical School Berlin, Berlin, Germany