1. Gastroenterology 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 Portugal
4. MEDCIDS—Department of Community Medicine, Information and Health Decision Sciences, Faculty of Medicine University of Porto Porto Portugal
5. CINTESIS—Center for Health Technology and Services Research University of Porto Porto Portugal