1. Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
2. Digestive System Research Unit, University Hospital Vall d'Hebron, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (Ciberehd), Barcelona, Spain
3. Department of Biomedical and Neuro Motor Sciences, University of Bologna, Bologna, Italy
4. Department of Veterinary Medicine, University of Bologna, Ozzano, Italy
5. Digestive Disease Division, Departments of Medicine and Neurobiology, University of California, Los Angeles, California
6. Department of Medical Sciences, University of Ferrara, Ferrara, Italy