[1] Leiden Univ, Med Ctr LUMC, Radiat Oncol Dept, Leiden, Netherlands
[2] Netherlands Canc Inst Antoni van Leeuwenhoek, Gastroenterol & Hepatol, Amsterdam, Netherlands
[3] Radboud UMC, Surg, Nijmegen, Netherlands
[4] Netherlands Canc Inst Antoni van Leeuwenhoek, Gastroenterol & Hepatol, Amsterdam, Netherlands
[5] Catharina Hosp, Surg, Eindhoven, Netherlands
[6] Erasmus MC, Daniel Den Hoed Canc Ctr, Radiat Oncol Dept, Rotterdam, Netherlands
[7] Amsterdam Med Ctr AMC, Med Oncol, Amsterdam, Netherlands
[8] Catharina Hosp, Dept Radiat Oncol, Eindhoven, Netherlands
[9] Univ Med Ctr Groningen UMCG, Med Oncol, Groningen, Netherlands