1. Department of Pharmaceutical Sciences and Biotechnology Center and Department of Experimental and Clinical Medicine, Section of Pharmacology and Neuroscience Centre, University of Ferrara, 44100 Ferrara, Italy, and University Department Cardiovascular Sciences (Pharmacology and Therapeutics Group), Clinical Division of Anaesthesia, Critical Care and Pain Management, Leicester Royal Infirmary, Leicester, LE1 5WW, U.K.