1. Department of Internal Medicine Centro Hospitalar e Universitário de Coimbra Coimbra Portugal
2. Faculty of Medicine University of Coimbra Coimbra Portugal
3. Department of Gastroenterology Centro Hospitalar e Universitário Lisboa Norte Lisboa Portugal
4. Department of Gastroenterology Centro Hospitalar de Vila Nova de Gaia e Espinho Vila Nova de Gaia Portugal
5. Department of Gastroenterology Centro Hospitalar do Algarve, Hospital de Faro Faro Portugal
6. Department of Gastroenterology Hospital Espírito Santo Évora Portugal
7. Biosystems and Integrative Science Institute (BioISI) Instituto Nacional de Saúde Dr. Ricardo Jorge Lisboa Portugal
8. Laboratory of Biostatistics and Medical Informatics, Faculty of Medicine University of Coimbra Coimbra Portugal
9. Instituto de Higiene e Medicina Social Faculty of Medicine University of Coimbra Coimbra Portugal
10. Centro de Estudos de Medicina Baseada na Evidência Faculdade de Medicina Universidade de Lisboa Lisboa Portugal
11. Department of Public Health and Caring Sciences Uppsala University Uppsala Sweden
12. Clínica Universitária de Gastrenterologia Faculdade de Medicina Universidade de Lisboa Lisboa Portugal