[1] Univ Naples Federico II, Paediat Sect, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, Italy
[2] Vrije Univ Brussel, UZ Brussel, Dept Paediat, Brussels, Belgium
[3] Emma Childrens Hosp AMC, Dept Paediat, Amsterdam, Netherlands
[4] Univ Hosp Cologne, Dept Paediat, Cologne, Germany
[5] Chelsea & Westmister NHS Healthcare Fdn, Dept Nutr & Dietet, London, England
[6] CHRU Lille, Jeanne de Flandre Univ Hosp, Fac Med, Dept Paediat, Lille, France
[7] Hosp Italiano Buenos Aires, Sect Gastroenterol Hepatol & Transplantat, Dept Pediat, Buenos Aires, DF, Argentina
[8] Univ Florence, Meyer childrens Hosp, Dept Neurosci Pharmacol & Child Hlth, Florence, Italy
[9] Univ Childrens Hosp Ljubljana, Dept Gastroenterol Hepatol & Nutr, Ljubljana, Slovenia
[10] Univ Athens, Childrens Hosp Agia Sofia, Dept Paediat 1, Gastroenterol Unit, Thivon, Greece
[11] La Fe Univ Hosp, Paediat Gastroenterol & Hepatol Unit, Valencia, Spain
[12] Univ Insubria, Dept Paediat, Varese, Italy
[13] Tel Aviv Univ, Sackler Fac Med, Schneider Childrens Med Ctr Israel, Tel Aviv, Israel
[14] Clin Grangettes, Paediat Ctr, Geneva, Switzerland
[15] Ctr Med Univ Geneva, Geneva, Switzerland
[16] Med Univ Warsaw, Dept Paediat, Warsaw, Poland
[17] Great Ormond St Hosp Sick Children, Gastroenterol Unit, London, England
[18] UCL Inst Child Hlth, London, England
[19] Hadassah Hebrew Univ Med Ctr, Paediat Gastroenterol, Jerusalem, Israel