1. Anesthesia and Pain Therapy, Department of Medical and Surgical Sciences, Policlinico S. Orsola-Malpighi, Bologna, Italy
2. Department of Anesthesia and Postoperative Intensive Care and Pain Therapy, Istituto Ortopedico Rizzoli, Bologna, Italy
3. Italian College of General Practitioners and Primary Care, Florence, Italy
4. Health Search, Italian College of General Practitioners and Primary Care, Florence, Italy