 The study is going to be sponsored by the Christoph-Dornier-Stiftung für Klinische Psychologie, which is a non-profit organization that supports research in clinical psychology and awards PhD scholarships to clinical psychologists. The study at hand is the major part of the PhD project of Christian Rupp, M. Sc., and Charlotte Juergens, M. Sc., who are currently holding a PhD scholarship by the Christoph-Dornier-Stiftung für Klinische Psychologie. The Christoph-Dornier-Stiftung für Klinische Psychologie collaborates with Department of Clinical Psychology at the University of Muenster Westfälische Wilhelms-Universität. The The PhD project is being supervised scientifically by Principal Investigator Prof. Dr. Ulrike Buhlmann, who is a professor of clinical psychology at the University of Muenster Westfälische Wilhelms-Universität, Germany. 