1. IBD Center; Humanitas Clinical and Research Centre; Milan; Italy
2. Icahn School of Medicine at Mount Sinai; New York, NY; USA
3. Department of Hepato-gastroenterology; University Hospital of Nancy-Brabois; Vandoeuvre-l'es-Nancy; France
4. Department of Medicine; University of Leuven; Leuven; Belgium
5. Department of Medicine; Medical University of Vienna; Vienna; Austria