1. Anesthesiology, Critical Care and Pain Medicine Division, Department of Medicine and Surgery, University of Parma, 43121 Parma, Italy
2. Endoscopy Unit, Department of Medicine, ULSS7 “Pedemontana”, “Alto Vicentino” Hospital, 36014 Santorso, Italy
3. Laboratory of Clinical Pathology, ULSS7 “Pedemontana”, “Alto Vicentino” Hospital, 36014 Santorso, Italy
4. Department of Medicine and Surgery, University of Parma, 43121 Parma, Italy
5. Division of Internal Medicine and Gastroenterology, “Cristo Re” Hospital, 00167 Rome, Italy
6. Territorial Gastroenterology Service, ASL BAT, 76123 Andria, Italy