1. 2a Anestesia Anestesia, Rianimazione e Terapia del Dolore, Azienda Ospedaliero Universitaria, Via Gramsci 14, 43126 Parma, Italy
2. Department of Surgical Sciences, University of Parma, Via Gramsci 14, 43126 Parma, Italy
3. SIMPAR Group (Study in Multidisciplinary Pain Research), Italy
4. U.O. Anestesia e Terapia Intensiva Polivalente, Azienda Ospedaliero-Universitaria Policlinico S. Orsola-Malpighi, Via Albertoni 15, 40138 Bologna, Italy