1. Department of Biomedical and Neuromotor Sciences, University of Bologna
2. Department of Mental Health – Pathological Addictions, Local Health Unit of Bologna, Bologna, Italy
3. Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
4. Department of Psychiatry, Radboud University Medical Center, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, The Netherlands