1 Department of Gastroenterology and Digestive Endoscopy, Champalimaud Foundation, Lisbon, Portugal.
2 Department of Pathology, Champalimaud Foundation, Lisbon, Portugal.
3 Department of Gastroenterology, Hepatopancreatology and Digestive Oncology, Erasme University Hospital, Université Libre de Bruxelles, Brussels, Belgium.