[1] Univ Med Ctr Utrecht, Dept Pediat Gastroenterol, Utrecht, Netherlands
[2] Amsterdam Univ Med Ctr, Emma Childrens Hosp, Amsterdam, Netherlands
[3] Univ Cologne, Fac Med, Dept Paediat, Cologne, Germany
[4] Univ Cologne, Univ Hosp Cologne, Cologne, Germany
[5] UMC Maribor, Dept Paediat, Paediat Gastroenterol Hepatol & Nutr Unit, Maribor, Slovenia
[6] Univ Ljubljana, Univ Childrens Hosp, Fac Med, Dept Gastroenterol Hepatol & Nutr, Ljubljana, Slovenia
[7] CHU Toulouse, Hop Enfants, Unite Gastroenterol Hepatol Nutr & Malad Herediti, F-31300 Toulouse, France
[8] Univ Toulouse, IRSD, INSERM, INRA,ENVT,UPS, Toulouse, France
[9] Univ Naples Federico II, Dept Translat Med Sci, Sect Paediat, Naples, Italy
[10] Victor Babes Univ Med & Pharm, Timisoara, Romania
[11] Great Ormond St Hosp Sick Children, Dept Paediat Gastroenterol, London, England
[12] Queensland Childrens Hosp, Dept Gastroenterol Hepatol & Liver Transplant, Brisbane, Qld, Australia
[13] Sheffield Childrens Hosp, Ctr Paediat Gastroenterol, Sheffield, S Yorkshire, England
[14] Sheffield Childrens Hosp, Int Acad Paediat Endoscopy Training, Sheffield, S Yorkshire, England
[15] Al Jalila Childrens Specialty Hosp, Dept Pediat Gastroenterol, Dubai, U Arab Emirates
[16] Erasmus MC, Sophia Childrens Hosp, Dept Pediat Gastroenterol, Wytemaweg 80, NL-3015 CN Rotterdam, Netherlands