1. Department of Neurosciences, Psychology, Drug Research and Child Health, Section of Pharmacology and Toxicology, University of Florence, Florence, Italy;
2. Health Search, Italian College of General Practitioners and Primary Care, Florence, Italy;
3. Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy;
4. Unit of Anaesthesiology and Pain Therapy, General Hospital S. Orso Malpighi, University Hospital of Bologna, Bologna, Italy;
5. Italian College of General Practitioners and Primary Care, Florence, Italy