Filippo Antonini1, Gaia Goteri2, Giampiero Macarri3. 1. Department of Gastroenterology, A. Murri Hospital, Polytechnic University of Marche, Fermo, Italy. Electronic address: filippore@yahoo.it. 2. Department of Clinical Sciences, Polytechnic University of Marche, Ancona, Italy. 3. Department of Gastroenterology, A. Murri Hospital, Polytechnic University of Marche, Fermo, Italy.