1. Department of Life and Environmental Sciences, University of Cagliari, Monserrato, Italy
2. Department of Psychobiology, University Jaume I, Castelló, Spain
3. Department of Biomedical Sciences, University of Cagliari, Monserrato, Italy
4. Department of Chemistry and Pharmacy, University of Sassari, Sassari, Italy
5. Department of Psychological Sciences, University of Connecticut, Storrs, USA
6. Centre of Excellence on Neurobiology of Addiction, University of Cagliari, Cagliari, Italy