1. Department of General Psychology: Cognition and Center for Behavioral Addiction Research, University of Duisburg-Essen, Duisburg, Germany
2. Erwin L. Hahn Institute for Magnetic Resonance Imaging, Essen, Germany
3. Department of Psychiatry, Social Psychiatry and Psychotherapy, Division of Clinical Psychology and Sexual Medicine, Hannover Medical School, Hannover, Germany
4. Institute for Sex Research, Sexual Medicine and Forensic Psychiatry, Center for Psychosocial Medicine, University Medical Center Hamburg-Eppendorf, Germany
5. Center for Systems Neuroscience Hannover, Hannover, Germany
6. Department of Psychotherapy and Systems Neuroscience, Justus Liebig University Giessen, Giessen, Germany
7. Center of Mind, Brain and Behavior, Universities of Marburg and Giessen, Germany