[1] Acad Med Ctr, Dept Gastroenterol, Amsterdam, Netherlands
[2] Mayo Clin, Dept Gastroenterol, Rochester, MN USA
[3] Mayo Clin, Dept Gastroenterol, Jacksonville, FL 32224 USA
[4] Univ Sydney, Westmead Hosp, Dept Gastroenterol, Sydney, NSW, Australia
[5] Univ Coll London Hosp, Dept Gastroenterol, London, England
[6] Univ Hosp Penn, Dept Gastroenterol, Pennsylvania, PA USA
[7] Univ Med Ctr Rotterdam, Erasmus MC, Dept Gastroenterol, Rotterdam, Netherlands
[8] Univ Cambridge, MRC Canc Unit, Cambridge, England
[9] GastroZentrum Hirslanden, Dept Gastroenterol, Zurich, Switzerland
[10] St Antonius Hosp, Dept Gastroenterol, Nieuwegein, Netherlands
[11] Catharina Hosp, Dept Gastroenterol, Eindhoven, Netherlands
[12] Queens Med Ctr, Dept Gastroenterol, Nottingham, England
[13] UZ Gasthuisberg Leuven, Dept Gastroenterol, Leuven, Belgium