1. Center for Health Technology and Services Research (CINTESIS) , Porto , Portugal
2. Portuguese Inflammatory Bowel Disease Study Group (GEDII) , Portugal
3. Department of Community Medicine, Information and Health Decision Sciences (MEDCIDS), Faculty of Medicine, University of Porto , Portugal
4. Department of Biomedicine, Unit of Pharmacology and Therapeutics, Faculty of Medicine, University of Porto , Porto , Portugal
5. Department of Gastroenterology, Tondela-Viseu Hospital Center , Viseu , Portugal
6. Department of Gastroenterology, Braga Hospital , Braga , Portugal
7. Department of Gastroenterology, Central Lisbon Hospital Center , Lisbon , Portugal
8. Department of Gastroenterology, Coimbra University Hospital Center , Coimbra , Portugal
9. Department of Gastroenterology and Hepatology, Northern Lisbon Hospital Center , Lisbon , Portugal
10. Department of Gastroenterology, Porto University Hospital Center , Porto , Portugal
11. Department of Gastroenterology, São João University Hospital Center , Porto , Portugal
12. Clinical Pharmacology Unit, São João University Hospital Center , Porto , Portugal