[1] Gedyt Endoscopy Ctr, C1117AAA, RA-2347 Buenos Aires, DF, Argentina
[2] Catholic Univ, Digest Endoscopy Unit, Rome, Italy
[3] Attikon Univ, Natl & Kapodistrian Univ, Dept Internal Med Propaedeut 2,Med Sch, Res Inst & Diabet Ctr,Gen Hosp,Hepatogastroentero, Athens, Greece
[4] CHU Charleroi & Vesale, ISPPC, Charleroi, Belgium
[5] Humanitas Mater Domini, Gastrointestinal Endoscopy Unit, Castellanza, Italy
[6] Humanitas Univ, Milan, Italy
[7] Heidelberg Univ, Klinikum Ludwigsburg, Dept Gastroenterol, Heidelberg, Germany
[8] Hop Univ Archet, Dept Gastroenterol & Endoscopy, Nice, France
[9] Catholic Univ, Digest Endoscopy Unit, Rome, Italy
[10] Univ Libre Bruxelles, Erasme Univ Hosp, Dept Gastroenterol Hepatopancreatol & Digest Onco, Brussels, Belgium
[11] Hosp Virgen La Luz, Dept Digest Dis, Cuenca, Spain
[12] Hungarian Def Forces, Med Ctr, Dept Gastroenterol, Budapest, Hungary
[13] Catholic Univ, Digest Endoscopy Unit, Rome, Italy
[14] Hop Cochin, AP HP, Gastroenterol Unit, Paris, France
[15] Radboud Univ Nijmegen, Med Ctr, Dept Gastroenterol & Hepatol, Nijmegen, Netherlands
[16] Univ Amsterdam, Amsterdam UMC, Dept Gastroenterol & Hepatol, Amsterdam, Netherlands