1. Department of Medicine and Surgery, University of Parma, Parma, Italy
2. Mood Disorders Program, Tufts Medical Center, Boston, MA, USA
3. Department of Neuroscience, University of Modena and Reggio Emilia, Reggio Emilia, Italy
4. Department of Psychiatry and Pharmacology, School of Medicine, Tufts University, Boston, MA, USA