[1] Vrije Univ Brussel VUB, Dept Pediat, UZ Brussel, KidZ Hlth Castle, Brussels, Belgium
[2] Hosp Italiano Buenos Aires, Pediat Gastroenterol Hepatol & Transplant Unit, Buenos Aires, Argentina
[3] Univ Amsterdam, Emma Childrens Hosp, Dept Pediat Gastroenterol & Nutr, Amsterdam UMC, Amsterdam, Netherlands
[4] Manila Cent Univ Hosp, Dept Pediat, Caloocan, Philippines
[5] Harvard Med Sch, Boston Childrens Hosp, Div Gastroenterol Hepatol & Nutr, Boston, MA USA
[6] Sheffield Childrens Hosp, Ctr Paediat Gastroenterol, Weston Bank, Sheffield, England