[1] Med Univ Warsaw, Dept Pediat Gastroenterol & Nutr, PL-01184 Warsaw, Poland
[2] Univ Milan, Milan, Italy
[3] Lund Univ, Malmo, Sweden
[4] Univ Childrens Hosp, Zurich, Switzerland
[5] Hop Necker Enfants Malad, Paris, France
[6] Univ Munich, Munich, Germany
[7] Royal Vet & Agr Univ, Frederiksberg, Denmark
[8] Univ Liege, Liege, Belgium
[9] Meyer Childrens Hosp, Haifa, Israel
[10] Univ Lille, Lille, France
[11] Univ Glasgow, Glasgow, Lanark, Scotland