1. Radiology Unit; Department of Diagnostic and Preventive Medicine; S. Orsola-Malpighi Hospital; Bologna Italy
2. Department of Medical and Surgical Sciences - DIMEC; S. Orsola-Malpighi Hospital; Alma Mater Studiorum - University of Bologna; Bologna Italy
3. Section of Gastroenterology; DIBIMIS; University of Palermo; Palermo Italy