1. Department of Experimental Oncology, European Institute of Oncology, Milan, Italy.
2. The Italian Foundation for Cancer Research (FIRC) Institute of Molecular Oncology (IFOM), Milan, Italy.
3. First Department of Medicine, St. Matteo Hospital, University of Pavia, Pavia, Italy.
4. Unità Operativa Gastroenterologia ed Endoscopia, Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico di Milano, and Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milan, Italy.
5. Department of Pathology and Laboratory Medicine, European Institute of Oncology, Milan, Italy.
6. Department of Biosciences, Università degli Studi di Milano, Italy.
7. Department of Genetics, Immunology and Pathology, Uppsala University, Uppsala, Sweden.