[1] Univ Zurich Hosp, Div Gastroenterol & Hepatol, Zurich, Switzerland
[2] Triemli Hosp Zurich, Div Gastroenterol & Hepatol, Birmensdorferstr 497, CH-8063 Zurich, Switzerland
[3] Praxis Romerhof, Olten, Switzerland
[4] Univ Bern, Inst Social & Prevent Med, Bern, Switzerland
[5] Natl Univ Malaysia, Div Gastroenterol, Med Ctr, Kuala Lumpur, Malaysia
[6] Univ Childrens Hosp Zurich, Div Gastroenterol, Zurich, Switzerland
[7] Univ Childrens Hosp Zurich, Nutr & Childrens Res Ctr, Zurich, Switzerland
[8] Kantonsspital Winterthur, Dept Pediat, Winterthur, Switzerland
[9] Kinderspital St Gallen, Div Gastroenterol & Hepatol, St Gallen, Switzerland
[10] CHU Vaudois, Univ Lausanne Hosp, Dept Pediat, Div Pediat Gastroenterol & Hepatol, Lausanne, Switzerland
[11] HCUG, Univ Hosp Geneva, Dept Pediat, Geneva, Switzerland
[12] Univ Childrens Hosp Bern, Div Gastroenterol & Hepatol, Bern, Switzerland
[13] UKBB, Univ Childrens Hosp Basel, Div Gastroenterol & Nutr, Basel, Switzerland
[14] LUKS, Kantonsspital Luzern, Dept Pediat, Luzern, Switzerland
[15] Clin Grangettes, Pediat Unit, Geneva, Switzerland
[16] Univ Hosp Basel, Div Gastroenterol & Hepatol, Basel, Switzerland
[17] CHU Vaudois, Div Gastroenterol & Hepatol, Univ Hosp Lausanne, Lausanne, Switzerland
[18] Hop Cantonal Fribourg, Dept Pediat, Fribourg, Switzerland