1. Department of Psychotherapy and Systems Neuroscience, Justus Liebig University of Giessen, Germany
2. Bender Institute of Neuroimaging, Justus Liebig University of Giessen, Germany
3. Center of Mind, Brain and Behavior, Universities of Marburg and Giessen, Germany
4. Clinical Psychology and Psychotherapy, University of Osnabrück, Germany
5. Department of Clinical Psychology and Psychotherapy, University Koblenz-Landau, Germany
6. Department of Clinical Psychology, Experimental Psychopathology and Psychotherapy, Philipps University of Marburg, Germany
7. Division of Clinical Psychology and Psychotherapy, Department of Psychology, Saarland University, Germany
8. Outpatient Clinic for Behavioral Addictions, Department of Psychosomatic Medicine and Psychotherapy, University Medical Center of the Johannes Gutenberg-University Mainz, Germany
9. Clinical Psychology and Psychotherapy, University of Trier, Germany
10. Clinical Psychology and Psychotherapy, Goethe University, Frankfurt, Germany
11. Aus-und Weiterbildungseinrichtung für klinische Verhaltenstherapie (AWKV), Kassel, Germany
12. Institute for Healthcare Management and Research, University Duisburg-Essen, Essen, Germany