1. Gastroenterology Unit; Medical Section; Herlev University Hospital; Copenhagen Denmark
2. Rho Hospital; Rho Italy
3. IBD clinical and research centre; Charles University; Prague Czech Republic
4. University of Padua; Padua Italy
5. San Gerardo Hospital; Monza Italy
6. La Princesa University Hospital IP and CIBEREHD; Madrid Spain
7. Cento Hospital; Cento Italy
8. Roman Y Cajal; Madrid Spain
9. University Federico II Hospital; Naples Italy
10. II University Hospital; Naples Italy
11. San Giovanni; Rotondo Italy
12. Policlinico S. Orsola; Bologna Italy
13. Institute for Epidemiology and Prevention Research; Bremen Germany
14. University of Lausanne; Lausanne Switzerland
15. The Adelaide and Meath Hospital; Trinity College; Dublin Ireland
16. University Hospital; Joanina Greece
17. University Hospital; Vienna Austria
18. Heilig Hartziekenhus; Roeselare Belgium
19. Statens Serum Institute; Copenhagen Denmark
20. Herlev University Hospital; Copenhagen Denmark
21. University Hospital; Amsterdam the Netherlands