1. Department of MedicineDivision of Gastroenterology and HepatologyRadboud University Medical CenterNijmegenThe Netherlands
2. Department of MedicineDivision of Gastroenterology and HepatologyUniversity Hospital ZurichZurichSwitzerland
3. ³Department of MedicineDivision of RheumatologySint MaartenskliniekNijmegenThe Netherlands
4. Department of MedicineDivision of DermatologyRadboud University Medical CentreNijmegenThe Netherlands