1. Department of Clinical and Experimental Medicine, University of Catania, University Hospital ‘G. Rodolico’, Catania, 95124, Italy
2. Department of Drug Science, University of Catania, Catania, Italy
3. Departments of Medicine, Pharmacology and Gastroenterology, New York Medical College, Valhalla, NY, USA
4. Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy