[1] Int Acad Paediat Endoscopy Training, Sheffield Childrens Hosp, Weston Bank, Sheffield S10 2TH, S Yorkshire, England
[2] Catholic Univ, Digest Endoscopy Unit, Rome, Italy
[3] Gedyt Doscopy Ctr, Buenos Aires, DF, Argentina
[4] Ctr Hosp Sao Joao, Dept Pediat Gastroenterol, Porto, Portugal
[5] Acad Med Ctr, Emma Childrens Hosp, Dept Pediat Gastroenterol, Amsterdam, Netherlands
[6] Univ Childrens Hosp Basel, Dept Pediat Gastroenterol & Nutr, Basel, Switzerland
[7] Erasmus MC Canc Inst, Dept Gastroenterol, Rotterdam, Netherlands
[8] Nuovo Regina Margherita Hosp, Dept Gastroenterol, Rome, Italy
[9] Alder Hey Childrens Hosp, Dept Pediat Gastroenterol, Liverpool, Merseyside, England
[10] Erasmus MC, Sophia Childrens Hosp, Dept Pediat Surg & Intens Care, Rotterdam, Netherlands
[11] Robert Debre Hosp, Dept Pediat Gastroenterol, Paris, France
[12] IRCCS, Bambino Gesu Children Hosp, Digest Endoscopy & Surg Unit, Rome, Italy
[13] Univ Childrens Hosp Ljubljana, Dept Gastroenterol Hepatol & Nutr, Ljubljana, Slovenia
[14] Vrije Univ Brussel, UZ Brussel, Pediat Gastroenterol, Brussels, Belgium
[15] Motol Univ Hosp, Dept Gastroenterol, Prague, Czech Republic
[16] Univ Messina, Dept Pediat, Messina, Italy
[17] Rudolfstiftung Hosp, Med Dept 4, Vienna, Austria
[18] Childrens Hosp Freiburg Univ, Dept Gen Pediat, Freiburg, Germany
[19] Med Univ Vienna, Dept Internal Med 3, Div Gastroenterol & Hepatol, Vienna, Austria
[20] Leeds Teaching Hosp NHS Trust, Dept Gastroenterol, Leeds, W Yorkshire, England
[21] Med Univ Vienna, Dept Pediat Nephrol & Gastroenterol, Vienna, Austria
[22] Univ Hosp, Rikshosp, OUS, GI Endoscopy Unit, Oslo, Norway
[23] Osped Nuovo Robbiani Soresina, Gastroenterol & Digest Endoscopy Unit, Soresina, Italy