1. Department of Gastroenterology Cochin Hospital, Groupe Hospitalier Paris CentreParis France
2. Department of Histopathology Cochin Hospital, Groupe Hospitalier Paris CentreParis France
3. Department of Biostatistics and Epidemiology Cochin Hospital, Groupe Hospitalier Paris CentreParis France
4. Paris-Descartes UniversityParis France