[1] AGAPLESION Markus Krankenhaus, Dept Surg, D-60431 Frankfurt, Germany
[2] IRCAD Inst, Strasbourg, France
[3] Univ Med Ctr Utrecht, Utrecht, Netherlands
[4] Krankenhaus Neuwerk, Dept Surg, Monchengladbach, Germany
[5] Univ Pecs, Dept Surg, Pecs, Hungary
[6] Maingau Krankenhaus, Grp Practice Resp Unit, Frankfurt, Germany
[7] Krankenhaus Zell Am See, Dept Surg, Zell Am See, Austria
[8] Univ Padua, Dept Gastroenterol, I-35100 Padua, Italy
[9] Univ Utrecht, Dept Pediat Surg, Utrecht, Netherlands
[10] Univ London Imperial Coll Sci Technol & Med, Dept Surg, London, England