[1] Univ Verona, Policlin GB Rossi, Dept Gen Surg, IT-37134 Verona, Italy
[2] Univ Marburg, Dept Surg, Marburg, Germany
[3] Univ Uppsala Hosp, Dept Endocrinol, Uppsala, Sweden
[4] Tech Univ Munich, Dept Pathol, Munich, Germany
[5] Fac Med Porto, Oporto, Portugal
[6] IPATIMUP, Oporto, Portugal
[7] Inst Alexander Fleming, Buenos Aires, DF, Argentina
[8] Inst Catala Oncol IDIBELL, Dept Oncol, Barcelona, Spain
[9] Antoni van Leeuwenhoek Hosp, Netherlands Canc Inst, Amsterdam, Netherlands
[10] Hop Beaujon, Serv Gastroenterol, Clichy, France
[11] CHU Beaujon, Serv Endoscopie Digest, Paris, France
[12] Univ Paris Diderot, Paris, France