1. Gastroenterology Department, Hospital Santa Luzia, Viana do Castelo, Portugal
2. Gastroenterology Department, Centro Hospitalar Cova da Beira EPE, Covilhã, Portugal
3. Gastroenterology Department, Instituto Português de Oncologia do Porto Francisco Gentil, Porto, Portugal
4. Radiology Department, Centro Hospitalar do Porto, Porto, Portugal
5. Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal
6. ICVS/3B’s – PT Government Associate Laboratory, Braga/Guimarães, Portugal