[1] Necker Enfants Malad Hosp, Pediat Gastronterol, Paris, France
[2] Univ Hosp La Paz, Pediat Gastronterol, Madrid, Spain
[3] Beaujon Hosp, Gastroeterol, Clichy, France
[4] Univ Hosp, Pediat Gastronterol, Leuven, Belgium
[5] Sahlgrens Univ Hosp, Pediat Gastronterol, Gothenburg, Sweden
[6] Birmingham Childrens Hosp, Pediat Gastronterol, Birmingham, W Midlands, England