[1] Odense Univ Hosp, Hans Christian Andersen Childrens Hosp, Odense, Denmark
[2] Univ Munich, Div Paediat Gastroenterol & Hepatol, Dr von Hauner Childrens Hosp, Munich, Germany
[3] Univ Debrecen, Med & Hlth Sci Ctr, Debrecen, Hungary
[4] Leiden Univ, Dept Paediat, Med Ctr, NL-2300 RA Leiden, Netherlands
[5] UCL, Med Sch Paediat & Child Hlth, London WC1E 6BT, England
[6] Tel Aviv Univ, Inst Gastroenterol Nutr & Liver Dis, Schneider Childrens Med Ctr Israel, Sackler Fac Med, Tel Aviv, Israel
[7] Univ Naples Federico II, Dept Paediat, Naples, Italy
[8] Univ Naples Federico II, European Lab Invest Food Induced Dis, Naples, Italy
[9] Univ Bremen, Ctr Social Policy Res, Bremen, Germany
[10] Univ Politecn Marche, Dept Paediat, Marche, Italy
[11] Univ Tampere, Paediat Res Ctr, FIN-33101 Tampere, Finland
[12] Tampere Univ Hosp, Tampere, Finland
[13] La Fe Univ Hosp, Valencia, Spain
[14] Univ Trieste, Dept Paediat, IRCCS Burlo Garofolo, I-34127 Trieste, Italy
[15] Univ Giessen, Dept Gen Paediat & Neonatol, D-35390 Giessen, Germany