[1] Univ St Luc, Brussels, Belgium
[2] State Univ Ghent Hosp, B-9000 Ghent, Belgium
[3] Univ Med Ctr, Leiden, Netherlands
[4] Univ Antwerp Hosp, Dept Med Oncol, Antwerp, Belgium
[5] Inst J Paoli I Calmettes, F-13009 Marseille, France
[6] Akad Univ Hosp, Uppsala, Sweden
[7] Univ Naples 2, Dipartimento Med Chirurg Internist Clin & Sperime, Naples, Italy
[8] Inst Oncol So Switzerland, Bellinzona, Switzerland
[9] MErck KG&A, R&D Med Sci Oncol, Darmstadt, Germany
[10] Univ Hosp Gasthuisberg, Dept Gastroenterol, B-3000 Louvain, Belgium