1. Department of Internal Medicine and Therapeutics, University of Pavia, Italy, 27100 Pavia, Italy
2. Gastroenterology Unit of Pavia Institute, Istituti Clinici Scientifici Maugeri IRCCS, 27100 Pavia, Italy
3. Department of Surgery, Oncology and Gastroenterology, University of Padova, 35128 Padua, Italy
4. Department of Translational Medicine, St. Anna Hospital, University of Ferrara, 44121 Ferrara, Italy
5. Mucosal Immunology and Biology Research Center, Massachusetts General Hospital-Harvard Medical School, Boston, MA 02114, USA
6. Unit of Internal Medicine, “V. Cervello” Hospital, Ospedali Riuniti “Villa Sofia-Cervello”, 90146 Palermo, Italy
7. Department of Health Promotion Sciences, Maternal and Infant Care, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, 90127 Palermo, Italy
8. Institute for Biomedical Research and Innovation (IRIB), National Research Council (CNR), 90146 Palermo, Italy
9. Department of Medicine, Surgery and Dentistry, Scuola Medica Salernitana, University of Salerno, 84081 Salerno, Italy
10. Unit of Gastroenterology, Azienda Ospedale Università Padova, 35128 Padova, Italy