1. Department of Medicine and Surgery, Section of Anatomic Pathology and Histology, Medical School, University of Perugia, Perugia, Italy
2. Gastroenterology and Endoscopic section S.Camillo Clinic, Cremona, Italy
3. Institute of Pathology, A.S.S.T. Cremona, Cremona, Italy
4. Gastroenterology & Hepatology Section, Department of Medicine and Surgery, University of Perugia, Perugia, Italy
5. Institute of Pathology ASST-Spedali Civili Brescia, Brescia, Italy