1. Dermatology Unit, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy
2. Dermatology Unit, Department of Experimental, Diagnostic and Specialty Medicine, Universita degli Studi di Bologna Scuola di Medicina e Chirurgia, Bologna, Italy
3. Surgery of the Alimentary Tract, Department of Medical and Surgical Sciences, Sant'Orsola-Malpighi Hospital, Alma Mater Studiorum University of Bologna, Bologna, Italy
4. Pathology Unit, St. Orsola Malpighi University Hospital, Bologna, Italy