1. Department of Medical Sciences, University of Turin and Pathology Unit, Città della Salute e della Scienza Hospital, Torino, Italy
2. Department of Medical Sciences, University of Turin and Gastroenterology Unit, Città della Salute e della Scienza Hospital, Torino, Italy
3. Department of Surgical Sciences, University of Turin and Surgical Unit, Città della Salute e della Scienza Hospital, Torino, Italy
4. Pathology Unit, Città della Salute e della Scienza Hospital, Torino, Italy