1. Department of Biomedical Sciences, Section of Neuroscience and Clinical Pharmacology; University of Cagliari; Cagliari Italy
2. Neuroscience Institute, National Research Council of Italy, Section of Cagliari; Cagliari Italy
3. Department of Chemistral and Geological Sciences; University of Cagliari; Cagliari Italy
4. Pain Therapy Unit, Azienda Ospedaliera “Brotzu,” ASL 8; Cagliari Italy