[1] Univ Hosp Gasthuisberg, Digest Oncol Unit, B-3000 Louvain, Belgium
[2] Vall dHebron Univ Hosp, Med Oncol Serv, Dept Oncol, Barcelona, Spain
[3] Masaryk Mem Canc Inst, Dept Clin Oncol, Brno, Czech Republic
[4] Univ Hosp Motol, Prague, Czech Republic
[5] Univ Witwatersrand, Sch Med, Johannesburg, South Africa
[6] St Petersburg Med Acad, St Petersburg, Russia
[7] Sanofi Rech, Res & Dev, Vitry Sur Seine, France
[8] Univ Florida, Gainesville, FL USA