[1] Univ Amsterdam, Acad Med Ctr, Gastroenterol, Meibergdreef 9, NL-1105 AZ Amsterdam, Netherlands
[2] Univ Hosp Gasthuisberg, Gastroenterol, Leuven, Belgium
[3] AZ Damiaan, Oostende, Belgium
[4] AZ Delta, Roeselare, Belgium
[5] Imelda GI Clin Res Ctr, Bonheiden, Belgium
[6] Hop Claude Hurriez, Lille, France
[7] Hop Estaing, Clermont Ferrand, France
[8] Hop Beaujon, Clichy, France
[9] Hosp Archet, Nice, France
[10] Erasmus MC, Rotterdam, Netherlands
[11] St Lukas Hosp, Brugge, Belgium
[12] Hop Rangueil, Toulouse, France
[13] Hop Sart Tilman, Liege, Belgium
[14] Free Univ Brussels, Hop Erasme, 808 Route Lennik, B-1070 Brussels, Belgium
[15] Univ Ghent, B-9000 Ghent, Belgium
[16] Free Univ Brussels, Brussels, Belgium
[17] Hop Brabois, Nancy, France
[18] Hop Robert Debre, Reims, France
[19] Hop St Louis, Paris, France
[20] Ziekenhuis Oost Limburg, Genk, Belgium
[21] Hop Trousseau, Tours, France
[22] Univ Utrecht, Utrecht, Netherlands
[23] Univ Hosp Maastricht, Maastricht, Netherlands
[24] Univ Leuven, Leuven, Belgium
[25] Dept Biostat St Louis, Paris, France
[26] Haut Leveque, Pessac, France