[1] Ctr Hosp S Joao, Dept Pediat, P-4202451 Oporto, Portugal
[2] Childrens Hosp Zagreb, Fac Med, Zagreb, Croatia
[3] Hebrew Univ Jerusalem, Juliet Keidan Inst Pediat Gastroenterol & Nutr, Shaare Zedek Med Ctr, Jerusalem, Israel
[4] Hvidovre Univ Hosp, Dept Pediat, Hvidovre, Denmark
[5] Univ Helsinki, Childrens Hosp, Pediat Surg, Helsinki, Finland
[6] Univ Hosp Southampton, Dept Pediat Gastroenterol, Southampton, Hants, England
[7] Med Univ Warsaw, Dept Pediat Gastroenterol & Nutr, Warsaw, Poland
[8] Univ Hosp Motol, Dept Pediat, Prague, Czech Republic
[9] Queen Marys Hosp Children, Epsom & St Helier NHS Trust, Surrey, England
[10] Chelsea & Westminster Hosp, London, England
[11] Paris Diderot Sorbonne Paris Cite Univ, Paris, France
[12] Robert Debre Hosp, Paris, France
[13] Ludwig Maximilians Univ Munchen, Dr von Hauner Childrens Hosp, Pediatr Gastroenterol & Hepatol, Munich, Germany
[14] St Georges Univ London, London, England
[15] Boston Childrens Hosp, Boston, MA USA
[16] Harvard Med Sch, Boston, MA USA
[17] Univ Florence, Meyer Hosp, Dept NEUROFARBA, Florence, Italy
[18] Hosp San Juan Dios, Unit Comprehens Care Pediat Inflammatory Bowel Di, Barcelona, Spain
[19] Paris Descartes Univ, Sorbonne Paris Cite Univ,Necker Enfants Malades U, Inst IMAGINE, INSERM U1163,Dept Pediat Gastroenterol, Paris, France
[20] Ruth Childrens Hosp, Rambam Med Ctr, Pediat Gastroenterol Inst, Haifa, Israel
[21] Bristol Royal Hosp Children, Dept Pediat Gastroenterol, Bristol, Avon, England
[22] Univ Naples Federico II, Dept Translat Med Sci, Sect Pediat, Naples, Italy
[23] Leeds Childrens Hosp, Leeds Gen Infirm, Dept Pediat Surg, Leeds, W Yorkshire, England
[24] Univ Edinburgh, Child Life & Hlth, Edinburgh, Midlothian, Scotland
[25] Harvard Med Sch, MassGen Hosp Children, Boston, MA USA
[26] Univ Helsinki, Childrens Hosp, Helsinki, Finland