1. Gastroenterology, Department of Public Health, University Federico II of Naples, 80131 Naples, Italy
2. Division of Internal Medicine and Digestive Physiopathology, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Policlinico S. Orsola, 40138 Bologna, Italy
3. Department of Medical and Surgical Sciences, University of Bologna, 40138 Bologna, Italy
4. CEMAD—IBD UNIT—Unità Operativa Complessa di Medicina Interna e Gastroenterologia, Dipartimento di Scienze Gastroenterologiche, Endocrino-Metaboliche e Nefro-Urologiche, Fondazione Policlinico Universitario “A. Gemelli” IRCCS, 00168 Rome, Italy
5. Division of Gastroenterology, “Brotzu” Hospital, 09124 Cagliari, Italy
6. Gastroenterology and Hepatology Unit, ASST Santi Paolo e Carlo, 20142 Milan, Italy
7. Department of Health Sciences, University of Milan, 20142 Milan, Italy
8. Gastroenterology Unit, Azienda Ospedaliera di Rilievo Nazionale e di Alta Specializzazione Garibaldi, 95123 Catania, Italy