[1] Katholieke Univ Leuven, Univ Hosp Gasthuisberg, Digest Oncol Unit, B-3000 Louvain, Belgium
[2] Katholieke Univ Leuven, Ctr Human Genet, Louvain, Belgium
[3] Catholic Univ Louvain, Clin Univ St Luc, Serv Gastroenterol, Brussels, Belgium
[4] Katholieke Univ Leuven, Univ Hosp Gasthuisberg, Dept Morphol & Mol Pathol, Louvain, Belgium
[5] Univ Libre Bruxelles, Erasme Univ Hosp, Gastrointestinal Canc Unit, Dept Gastroenterol, Brussels, Belgium
[6] Ghent Univ Hosp, Digest Oncol Unit, B-9000 Ghent, Belgium
[7] Catholic Univ Louvain, Clin Univ St Luc, Ctr Canc, Clin Pathol Tumorales Colon & Rectum, Brussels, Belgium