1 Department of Gastroenterology and Pancreatology, Beaujon University Hospital, AP-HP and University Paris 7 - Denis Diderot, Clichy, France. Electronic address: louis.demestier@aphp.fr.
2 Department of Pathology, Beaujon University Hospital, AP-HP and University Paris 7 - Denis Diderot, Clichy, France.
3 Department of Digestive Oncology, Beaujon University Hospital, AP-HP and University Paris 7 - Denis Diderot, Clichy, France.