[1] Med Univ Warsaw, Dept Paediat, Warsaw, Poland
[2] Tel Aviv Univ, Sackler Fac Med, IL-69978 Tel Aviv, Israel
[3] Leiden Univ, Med Ctr, Dept Pediat, Leiden, Netherlands
[4] La Fe Univ Hosp, Pediat Gastroenterol & Hepatol, Valencia, Spain
[5] Marche Polytech Univ, Dept Pediat, Ancona, Italy
[6] Umea Univ, Pediat, Dept Clin Sci, Umea, Sweden
[7] UCL Inst Child Hlth, Childhood Nutr Res Ctr, London, England
[8] Odense Univ Hosp, Hans Christian Andersen Childrens Hosp, DK-5000 Odense, Denmark
[9] Univ Athens, Childrens Hosp Agia Sophia, Dept Pediat 1, Div Gastroenterol & Hepatol, Athens, Greece
[10] Vrije Univ Brussel, UZ Brussel, Dept Pediat, Brussels, Belgium
[11] Hosp Univ St Joan de Reus, IISPV, URV, Pediat Gastroenterol Unit, Reus, Spain
[12] Zagreb Med Univ, Childrens Hosp, Dept Pediat, Zagreb, Croatia
[13] Univ Munich, Dr von Hauner Childrens Hosp, Munich, Germany
[14] Univ Debrecen Med Sch, Dept Paediat, Debrecen, Hungary
[15] Heim Pal Childrens Hosp, Budapest, Hungary
[16] Univ Catania, Dept Pediat, Catania, Italy
[17] Autonomous Univ Madrid, La Paz Childrens Univ Hosp, E-28049 Madrid, Spain
[18] Univ Naples Federico II, Naples, Italy