1. Gastroenterology Unit, Spedali Civili Hospital, 25123 Brescia, Italy
2. Department of Internal Medicine and Medical Therapy, University of Pavia, 27100 Pavia, Italy
3. Unit of Translational Physiology and Nutrition, Department of Biological, Geological and Environmental Sciences, University of Bologna, 40126 Bologna, Italy
4. Microbiology Unit, IRCCS, Azienda Ospedaliero-Universitaria di Bologna, University of Bologna, Via Massarenti 9, 40138 Bologna, Italy
5. Department of Experimental and Clinical Science, University of Brescia, 25123 Brescia, Italy