[1] Al Jalila Childrens Specialty Hosp, Paediat Gastroenterol Dept, Dubai, U Arab Emirates
[2] Mohammed Bin Rashid Univ Med & Hlth Sci, Dubai, U Arab Emirates
[3] Hebrew Univ Jerusalem, Juliet Keidan Inst Pediat Gastroenterol, Shaare Zedek Med Ctr, Nutr, Jerusalem, Israel
[4] Great Ormond St Hosp Sick Children, Dept Paediat Gastroenterol, Div Neurogastroenterol & Motil, London, England
[5] Univ Cologne, Fac Med, Dept Paediat, Cologne, Germany
[6] Hosp St Joan Deu, Barcelona, Spain
[7] Womans & Childs Univ Hosp Verona, Dept Paediat, Verona, Italy
[8] Univ Med Ctr Maribor, Dept Pediat, Maribor, Slovenia
[9] Univ Ljubljana, Univ Childrens Hosp, Fac Med, Ljubljana, Slovenia
[10] Univ Toulouse, Hop Enfants, Serv Gastroenterol Hepatol Nutr & Malad Hereditair, IRSD, Toulouse, France
[11] Univ Naples Federico II, Dept Translat Med Sci, Sect Pediat, Naples, Italy
[12] Sheffield Childrens Hosp NHS Fdn Trust, Ctr Paediat Gastroenterol, Weston Bank, Sheffield, England
[13] Amsterdam Univ Med Ctr, Emma Childrens Hosp, Dept Paediat, Amsterdam, Netherlands
[14] Amsterdam Univ Med Ctr, Emma Childrens Hosp, Dept Paediat, NL-1105 AZ Amsterdam, Netherlands