Authors: Ulrich Töx; Ingo Scheller; Norbert Kociok; Michael André Kern; Dejan Klanac; Sharif Mohammed Daudi; Oliver Laue; Peter Schirmacher; Tobias Goeser; Sigrid Schulte; Hans Michael Steffen Journal: Dig Dis Sci Date: 2007-04-04 Impact factor: 3.487