1 Gastroenterology & Hepatology Section, Perugia General Hospital, Perugia, Italy.
2 Anatomic Pathology & Histology Section.
3 Gastroenterology & Hepatology Section, Perugia General Hospital, Perugia, Italy; Gastroenterology, Hepatology & Digestive Endoscopy Section, Department of Medicine & Surgery, University of Perugia, Perugia, Italy.
4 Gastroenterology & Hepatology Section, Perugia General Hospital, Perugia, Italy; Gastroenterology, Hepatology & Digestive Endoscopy Section, Department of Medicine & Surgery, University of Perugia, Perugia, Italy. Electronic address: gabassot@gmail.com.