1. Anesthesiology and Pain Medicine, Department of Life, Health and Environmental Sciences, University of L’Aquila, Viale San Salvatore, Edificio 6, 67100 L’Aquila, Italy
2. Operative Unit of Anesthesiology, Intensive Care and Pain Medicine, Civil Hospital “G. Mazzini” of Teramo, Piazza Italia, 64100 Teramo, Italy