1. Department of Gastroenterology, Jessenius Faculty of Medicine, Comenius University Bratislava, Kollárova 2, Martin 036 01, Slovakia
2. Department of Gastroenterology, Grigore T Popa University of Medicine and Pharmacy, Iasi, Romania
3. Sf Spiridon County Clinical Emergency Hospital, Iasi, Romania
4. Department of Gastroenterology, Jessenius Faculty of Medicine, Comenius University Bratislava, Martin, Slovakia
5. Second Gastroenterology Department, Centre of Postgraduate Medical Education, Warsaw, Poland
6. Department of Gastroenterology and Hepatology, Division of Internal Medicine, University Hospital Center Zagreb, Zagreb, Croatia
7. Department of Gastroenterology, Nicolae Testemitanu State University of Medicine and Pharmacy, Chisinau, Moldova
8. First Department of Medicine, University of Szeged Faculty of Medicine, Szeged, Hungary
9. IBD Clinical and Research Center, ISCARE a.s. and the First Faculty of Medicine, Charles University, Prague, Czech Republic