1. Department of Gastroenterology, Centro Hospitalar Tondela-Viseu, E.P.E., Viseu, Portugal
2. Department of Gastroenterology, Unidade Local de Saúde Alto Minho, Viana do Castelo, Portugal
3. Department of Gastroenterology, Nova Medical School/Faculty of Medical Sciences, Lisbon, Portugal
4. Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal
5. ICVS/3B’s – PT Government Associate Laboratory, Braga/Guimarães, Portugal