1 Department of Pharmacology and Therapeutics, Faculty of Medicine of the University of Porto, Portugal.
2 Gastroenterology Department, Instituto Português de Oncologia de Lisboa, Lisboa, Portugal.
3 Gastroenterology Department, Centro Hospitalar do Porto, Porto, Portugal.
4 Department of Pediatrics, Centro Hospitalar São João, Porto, Portugal.
5 Department of Gastroenterology and Hepatology, Hospital de Santa Maria, University of Lisbon, Lisbon, Portugal.
6 Department of Community Medicine, Information and Decision in Health, Faculty of Medicine of the University of Porto, Portugal; CINTESIS - Centre for Health Technology and Services Research, Porto, Portugal.
7 Department of Gastroenterology, Faculty of Medicine, Centro Hospitalar São João, Porto, Portugal.