[1] Childrens Hosp, Div Gastroenterol, Ctr Motil & Funct Gastrointestinal Disorders, 300 Longwood Ave, Boston, MA 02115 USA
[2] Vrije Univ Brussel, KidZ Hlth Castle, UZ Brussel, Brussels, Belgium
[3] Emma Childrens Hosp, AMC, Amsterdam, Netherlands
[4] Univ Calif San Francisco, Div Gen Pediat, San Francisco, CA 94143 USA
[5] Ohio State Univ, Nationwide Childrens Hosp, Div Pediat Gastroenterol, Columbus, OH 43210 USA
[6] CHU Lille, Div Pediat Gastroenterol Hepatol & Nutr, Lille, France
[7] Univ Illinois, Div Pediat Gastroenterol Hepatol & Nutr, Peoria, IL USA
[8] Univ Amsterdam, Acad Med Ctr, Dept Clin Epidemiol Biostat & Bioinformat, Amsterdam, Netherlands
[9] Univ Naples Federico II, Sect Pediat, Dept Translat Med Sci, Naples, Italy
[10] Great Ormond St Hosp Sick Children, London, England
[11] Univ Mississippi, Med Ctr, Dept Pediat, Jackson, MS 39216 USA