1. Pathology Department; Azienda Ospedaliera Città della Salute e della Scienza di Torino; Torino Italy
2. Institute of Pathology; Spedali Civili di Brescia; Brescia Italy
3. Gastroenterology Unit; Perugia General Hospital; Perugia Italy
4. Gastroenterology Department; Ospedale Mauriziano; Torino Italy
5. Histology and Medical Embryology Unit; Department of Clinical and Experimental Medicine; University of Pisa; Pisa Italy
6. Gastroenterology and Hepatology Section; Department of Medicine; University of Perugia Medical School; Perugia Italy