[1] Great Ormond St Hosp NHS Fdn Trust, Dept Paediat Gastroenterol, Neurogastroenterol & Motil Unit, London, England
[2] UCL Great Ormond St Inst Child Hlth, Stem Cells & Regenerat Med, London, England
[3] Emma Childrens Hosp, Acad Med Ctr, Amsterdam, Netherlands
[4] Great Ormond St Hosp NHS Fdn Trust, Neonatal & Paediat Surg Dept, London, England
[5] Univ Montreal, St Justine Hosp, Div Pediat Gastroenterol, Montreal, PQ, Canada
[6] Univ Bologna, St Orsola Malpighi Hosp, CRBA, Dept Med & Surg Sci, Bologna, Italy
[7] Birmingham Childrens Hosp NHS Fdn Trust, Liver Unit, Steelhouse Lane, Birmingham, W Midlands, England
[8] Queen Mary Univ, Barts & London Sch Med & Dent, London, England
[9] Univ Naples Federico II, Sect Pediat, Dept Translat Med Sci, Naples, Italy
[10] Vrije Unversiteit Brussel, UZ Brussel, Dept Paediat, Brussels, Belgium
[11] Nationwide Childrens Hosp, Div Pediat Gastroenterol, Columbus, OH USA