1. Department of Health Economics, Corvinus University of Budapest, Fovam ter 8., H-1093 Budapest, Hungary
2. First Department of Medicine, Semmelweis University, Koranyi S. 2/A, H-1083 Budapest, Hungary
3. IBD Center, Division of Gastroenterology, Humanitas Clinical and Research Center, Rozzano, Milan, Italy
4. Department of Hepato-Gastroenterology, University Hospital of Nancy, Allee du Morvan, 54511 Vandoeuvre-l`s-Nancy, France