1. Department of Psychiatry, Social Psychiatry and Psychotherapy, Medical School Hannover, Hannover, Germany
2. Department of Psychiatry and Psychotherapy, Paracelsus Medical University Nuremberg, Nürnberg, Germany
3. Department of Addictive Behavior and Addiction Medicine, Central Institute of Mental Health, Medical Faculty Mannheim. Heidelberg University, Heidelberg, Germany
4. Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden