[1] Leiden Univ Med Ctr LUMC, Clin Genet, Leiden, Netherlands
[2] Univ Med Ctr Groningen, Clin Genet, Groningen, Netherlands
[3] Leiden Univ Med Ctr LUMC, Gastroenterol & Hepatol, Leiden, Netherlands
[4] Netherlands Canc Inst NKI, Gastrointestinal Oncol, Amsterdam, Netherlands
[5] Amsterdam UMC Iocatie AMC, Clin Genet, Amsterdam, Netherlands
[6] Univ Hosp Heidelberg, German Canc Res Ctr DKFZ, Clin Cooperat Unit Appl Tumor Biol, Heidelberg, Germany
[7] Leiden Univ Med Ctr LUMC, Pathol, Leiden, Netherlands