[1] UCL, Dept Histopathol, London, England
[2] Hop Hotel Dieu, Serv Gastroenterol, Paris, France
[3] Netherlands Canc Inst, Amsterdam, Netherlands
[4] Univ Bologna, Serv Anat Patol & Gastroenterol, I-40126 Bologna, Italy
[5] Univ Klinikum Carl Gustav Carus, Lab Mol Diagnost, Dresden, Germany
[6] Hop Lariboisiere, Serv Anat Pathol, F-75475 Paris, France
[7] Hop Hotel Dieu, Serv Anat Pathol, Paris, France
[8] Univ Bologna, I-40126 Bologna, Italy
[9] Univ Marburg, D-35032 Marburg, Germany
[10] Klinikum Bayreuth, Inst Pathol, Bayreuth, Germany