[1] Univ East Anglia UEA, Norwich Med Sch, Fac Med & Hlth Sci Norwich, Norfolk & Norwich Univ Hospitals, Norwich, Norfolk, England
[2] Jenny Lind Childrens Hosp, Paediat Gastroenterol, Norwich, Norfolk, England
[3] Sheffield Childrens NHS Fdn Trust, Paediat Gastroenterol, Sheffield, S Yorkshire, England
[4] Imperial Coll, St Marks Natl Bowel Hosp, Dept Inflammatory Bowel Dis, Dept Metab Digest & Reprod, London, England
[5] Univ Southampton, Southampton Childrens Hosp, Human Genet & Genom Med, Fac Med,Dept Paediat Gastroenterol, Southampton, Hants, England
[6] Evelina London Childrens Hosp, Dept Paediat Gastroenterol, London, England
[7] Maastricht Univ, Sch Nutr & Translat Res Metab, Med Ctr, Dept Gastroenterol & Hepatol, Maastricht, Netherlands
[8] Sheba Med Ctr, IBD Serv, Dept Gastroenterol, Tel Hashomer, Israel