1. Gastroenterology Unit; Department of Clinical Medicine and Surgery; Federico II University; Naples Italy
2. Division of Gastroenterology; Casa Sollievo Sofferenza Hospital; IRCCS; San Giovanni Rotondo Italy
3. Pharmacia Librandi; Cirò Marina Italy
4. Pharmacia Tor Millina; Rome Italy
5. Division of Internal Medicine and Clinical Immunology; San Martino Hospital; IRCCS; Genova Italy
6. Division of Emergency Medicine; San Carlo Hospital; Potenza Italy