[1] Univ Hosp Careggi, Dept Gastroenterol, I-500139 Florence, Italy
[2] AO Ordine Mauriziano, SC Gastroenterol, I-10128 Turin, Italy
[3] Univ Hosp North Tees, Tees Bowel Canc Screening Ctr, Stockton On Tees TS19 8PE, Cleveland, England
[4] Univ Durham, Durham, England
[5] CHU Henri Mondor, F-94010 Creteil, France
[6] AZ Imeldaziekenhuis, B-2820 Bonheiden, Belgium
[7] Univ Oxford, John Radcliffe Hosp, Nuffield Dept Clin Med, Translat Gastroenterol Unit,Expt Med Div, Oxford OX3 9DU, England
[8] Univ Hosp Gasthuisberg, Dept Gastroenterol, B-3000 Louvain, Belgium
[9] Univ Klinikum Tubingen, D-72076 Tubingen, Germany
[10] Univ Ioannina, Sch Med, Dept Gastroenterol, Ioannina 45110, Greece
[11] Johannes Gutenberg Univ Mainz, Med Klin & Poliklin 1, D-55131 Mainz, Germany
[12] Hosp Clin Barcelona, Dept Gastroenterol, E-08036 Barcelona, Spain
[13] IRCCS Humanitas, I-20089 Rozzano, Italy
[14] Ctr Hosp Alto Ave, P-4835 Guimaraes, Portugal
[15] Hull & East Yorkshire NHS Trust, Kingston Upon Hull HU3 2JZ, N Humberside, England
[16] Stadt Klinikum Luneberg, D-21339 Luneburg, Germany
[17] Sheba Med Ctr, IL-52621 Tel Hashomer, Israel