Scuola Medica Salernitana - Centre for Celiac Disease, Universidad del Salvador (Buenos Aires, Argentina), University of Nottingham - Royal Derby Hospital, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Verona, First Department of Internal Medicine, Università degli Studi di Pavia, Tel Aviv University, Carol Davila University of Medicine and Pharmacy, All India Institute of Medical Sciences (AIIMS), affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Sheffield Teaching Hospitals NHS Foundation Trust, affiliation not provided to SSRN, University of Brescia, affiliation not provided to SSRN, University of Padua - Padua General University Hospital and Independent

ASST Fatebenefratelli-Sacco University Hospital - Gastroenterology Unit, Department of Oncology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Gastroenterology Unit –Department of Biomedical and Clinical Sciences FBF -L.Sacco ̧ University Hospital, Department of Gastroenterology, Monash Health. Faculty of Medicine, Nursing &Health Sciences, Monash University, Department of Gastroenterology, Monash Health. Faculty of Medicine, Nursing &Health Sciences, Monash University, Gastroenterology Unit, IRCCS Policlinico San Donato, San Donato Milanese, Italy; Department of Biomedical Sciences for Health, University of Milan, Gastroenterology Unit –Department of Biomedical and Clinical Sciences FBF -L.Sacco ̧ University Hospital, First Department of Internal Medicine, Università degli Studi di Pavia, Gastroenterology Unit, Rho Hospital, Rho (MI), ASST Rhodense, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy; Division of Gastroenterology, ASST Spedali Civili, Papa Giovanni XXIII Hospital, Gastroenterology and Digestive Endoscopy Units, Department of Gastroenterology and Endoscopy, Maggiore Hospital, ASST Crema, Gastroenterology, G. da Saliceto Hospital, Gastroenterology Unit –Department of Biomedical and Clinical Sciences FBF -L.Sacco ̧ University Hospital, Gastroenterology Unit –Department of Biomedical and Clinical Sciences FBF -L.Sacco ̧ University Hospital, Gastroenterology Unit –Department of Biomedical and Clinical Sciences FBF -L.Sacco ̧ University Hospital, Gastroenterology Unit, IRCCS Policlinico San Donato, San Donato Milanese, Italy; Department of Biomedical Sciences for Health, University of Milan, First Department of Internal Medicine, Università degli Studi di Pavia, ASST Rhodense - Gastroenterology Unit, Department of Gastroenterology and Endoscopy, Maggiore Hospital, ASST Crema, I Division of Infectious Diseases, ASST Fatebenefratelli-Sacco, L. Sacco Hospital, Milan, Italy; School of Clinical Medicine, Faculty of Health Science University of Witwatersrand, University of Milan and Gastroenterology Unit –Department of Biomedical and Clinical Sciences FBF -L.Sacco ̧ University Hospital