1. Department of Surgical Sciences, University of Turin, Turin, Italy;
2. First Department of Internal Medicine, IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy;
3. S.C. Reumatologia, Città Della Salute e Della Scienza di Torino, Turin, Italy;
4. Unit of Gastroenterology, Molinette Hospital, Turin, Italy;
5. Department of Medical Sciences, University of Turin, Turin, Italy