1. Laboratory Unit, Fatebenefratelli Hospital, Milan, Italy
2. Rheumatology Unit, L. Sacco University Hospital, Milan, Italy
3. Division of Pathology and Gastroenterology, Guido Salvini Hospital, Rho (Milan), Italy
4. Divisions of Pathology and Gastroenterology, Fatebenefratelli Hospital, Milan, Italy
5. GI & Liver Unit, DI.BI.M.I.S. University of Palermo Policlinico, Palermo, Italy
6. IRCCS Galeazzi Orthopedic Institute, Milan, Italy