1. Institute of Biostructure and Bioimaging, CNR, Department of Molecular Biotechnology and Health Sciences, University of Turin, Italy
2. Molecular Biotechnology Center, Department of Molecular Biotechnology and Health Sciences, University of Turin, Italy
3. Candiolo Cancer Institute-IRCCS, University of Turin, Italy
4. present address: Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridgeshire CB10 1SA, UK
5. S.C. Gastroenterologia U, Endoscopia San Giovanni A.S., Azienda Città della Salute e della Scienza di Torino, Turin, Italy
6. EuroClone S.p.A Research Laboratory, Molecular Biotechnology Centre, University of Turin, Italy
7. Center for Experimental Research and Medical Studies, University of Turin, Italy
8. Department of Medical Sciences, University of Turin, Italy
9. Cancer Research Institute, BIDMC, Harvard Medical School, Boston, USA