1. Laboratory of Biophysics and Cytometry, National Cancer Institute (IST), Genoa, Italy
2. Pathology Service, University of Padua, Italy
3. Pathology Service, Cardarelli Hospital, Naple, Italy
4. Pathology Service, National Institute for Cancer Research and Treatment, Candiolo, Turin, Italy
5. Service of Gastroenterology, ASL1, S. Giovanni Vecchio Hospital, Turin, Italy