1. Rheumatology Unit, ASST-Fatebenefratelli L. Sacco University Hospital, University of Milan, Italy. piercarlo.sarziputtini@gmail.com
2. Rheumatology Unit, ASST-Fatebenefratelli L. Sacco University Hospital, University of Milan, Italy.
3. Rheumatology Unit, ATS Sardegna, P. Dettori Hospital, Tempio Pausania, Italy.
4. Gastrointestinal Unit, ASST-Fatebenefratelli Sacco. L. Sacco Department of Biochemical and Clinical Sciences, University of Milan, Italy.
5. Department of Infectious Diseases, I Division of Infectious Diseases ASST Fatebenefratelli-Sacco, Milan, Italy.
6. Department of Biomedical and Clinical Sciences 'Luigi Sacco', University of Milan, and III Division of Infectious Diseases, ASST Fatebenefratelli Sacco, Luigi Sacco Hospital, Milan, Italy.