[1] Univ Hosp Geneva, Serv Gastroenterol & Hepatol, CH-1211 Geneva 14, Switzerland
[2] Hop St Joseph, Dept Digest Endoscopy, Marseille, France
[3] New Cross Hosp, Wolverhampton, W Midlands, England
[4] Hop Univ Archet, Dept Gastroenterol & Endoscopy, Nice, France
[5] Hop St Philibert, Serv Pathol Digest, Lomme Les Lille, France
[6] Clin Univ St Luc, B-1200 Brussels, Belgium
[7] Hop Enfants La Timone, Dept Gastroenterol & Endoscopy, Marseille, France
[8] Hop Ambroise Pare, Dept Digest Endoscopy, Paris, France
[9] Univ Kentucky, Med Ctr, Div Gastroenterol, Lexington, KY USA
[10] Hop Montelimar, Dept Gastroenterol, Montelimar, France
[11] Gen Infirm, Dept Gastroenterol, Leeds LS1 3EX, W Yorkshire, England
[12] Univ Paris 07, Hop Bichat, AP HP, Dept Hematol, Paris, France
[13] Grp Hosp Pitie Salpetriere, INSERM, Inst Cardiol, U 937, F-75634 Paris, France
[14] Mayo Clin, Div Gastroenterol & Hepatol, Rochester, MN USA
[15] Hop Jean Mermoz, Dept Endoscopy, Lyon, France