[1] Free Univ Berlin, UZ Brussel, Brussels, Belgium
[2] Necker Childrens Hosp, Pediat Gastroenterol Hepatol & Nutr Dept, Paris, France
[3] Univ Hosp Geneva, Pediat Allergy Unit, Geneva, Switzerland
[4] Odense Univ Hosp, Hans Christian Andersen Childrens Hosp, Dept Paediat, DK-5000 Odense, Denmark
[5] Univ Helsinki, Childrens Hosp, Helsinki, Finland
[6] Univ Helsinki, Cent Hosp, Helsinki, Finland
[7] La Fe Univ Hosp, Paediat Gastroenterol & Hepatol Unit, Valencia, Spain
[8] Great Ormond St Hosp Sick Children, London WC1N 3JH, England
[9] Katholieke Univ Leuven, Louvain, Belgium
[10] TARGID, Leuven, Belgium
[11] Tel Aviv Univ, Sackler Fac Med, Schneider Childrens Med Ctr Israel, Inst Gastroenterol Nutr & Liver Dis, IL-69978 Tel Aviv, Israel
[12] Univ Naples Federico II, Dept Translat Med Sci, Sect Pediat, Naples, Italy
[13] Med Univ Warsaw, Dept Paediat, Warsaw, Poland
[14] Marien Hosp, Dept Pediat, Res Inst, Wesel, Germany