1. Gastrsoenterology Department, Hospital Senhora da Oliveira – Guimarães, Guimarães, Portugal;
2. Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal;
3. ICVS/3B’s, PT Government Associate Laboratory, Guimarães/Braga, Portugal;
4. Gastroenterology Department, Hospital de São João - Porto, Porto, Portugal;
5. Western Oporto Public Health Unit, Northern Regional Health Administration, Porto, Portugal