1. Unit of Gastroenterology, Città della Salute e della Scienza Hospital, C.so Bramante 88, 10126 Turin, Italy
2. Department of Medical Sciences, University of Turin, C.so A.M. Dogliotti 14, 10126 Turin, Italy
3. Institute for Biostructure and Bioimaging, National Research Council, Molecular Biotechnology Centre, 10126 Turin, Italy