1. Gastroenterology Unit Policlinico Universitario Tor Vergata Rome Italy
2. Gastroenterology Department ‐ unidade local de saúde do Algarve unidade de Portimão Portimão Portugal
3. ABC ‐ Algarve Biomedical Center Faro Portugal
4. Department of Gastroenterology and Hepatology Radboud University Medical Center Nijmegen the Netherlands