1 Gastroenterology Department, Portuguese Oncology Institute of Porto, Porto, Portugal. raquel.ortigao@hotmail.com.
2 Department of Pathology, Portuguese Oncology Institute of Porto, Porto, Portugal. j.azevedo122@gmail.com.
3 Gastroenterology Department, Portuguese Oncology Institute of Porto, Porto; MEDCIDS, Faculty of Medicine, University of Porto, Porto, Portugal. pedronunesml@gmail.com.
4 Gastroenterology Department, Portuguese Oncology Institute of Porto, Porto; MEDCIDS, Faculty of Medicine, University of Porto, Porto, Portugal. diogolibaniomonteiro@gmail.com.
5 Gastroenterology Department, Portuguese Oncology Institute of Porto, Porto; MEDCIDS, Faculty of Medicine, University of Porto, Porto, Portugal. mdinisribeiro@gmail.com.