[1] Univ Hosp Gasthuisberg, Dept Internal Med, B-3000 Louvain, Belgium
[2] Univ Hosp Gasthuisberg, Dept Pathol, B-3000 Louvain, Belgium
[3] Catholic Univ Louvain, Dept Gastroenterol, B-1200 Brussels, Belgium
[4] Free Univ Brussels, Dept Gastroenterol, Brussels, Belgium
[5] CAZ Groeninghe, Dept Gastroenterol, Kortrijk, Belgium
[6] Middelheim Hosp, Dept Gastroenterol, Antwerp, Belgium
[7] CHU Liege, Dept Gastroenterol, Liege, Belgium
[8] Ghent Univ Hosp, Dept Gastroenterol, B-9000 Ghent, Belgium