1. Children’s Hospital Zagreb, University of Zagreb Medical School , Zagreb , Croatia
2. Pediatric Gastroenterology Unit, Sapienza University–Umberto I Hospital , Rome , Italy
3. Pediatric Gastroenterology and Cystic Fibrosis Unit, Department of Human Pathology in Adulthood and Childhood, University of Messina , Italy
4. Department of Gastroenterology, Hepatology and Nutrition, Royal Hospital for Children and Young People , Edinburgh , UK
5. Pediatric Gastroenterology and Nutrition Unit, Sheba Medical Center, Tel-HaShomer, The Faculty of Medicine, Tel Aviv University , Tel Aviv , Israel
6. Department of Paediatrics, Second Faculty of Medicine, Charles University and University Hospital Motol , Prague , Czech Republic
7. DOCHAS Group, Children’s Health Ireland, University College Dublin , Dublin , Ireland
8. Department of Pediatrics, School of Medicine, Kyungpook National University , Daegu , Korea
9. Heim Pal National Pediatric Institute , Budapest , Hungary
10. University of Helsinki and Children´s Hospital, HUS , Helsinki Finland
11. Justus-Liebig-University Giessen, Childrens Hospital , Giessen , Germany
12. Institute for Maternal and Child Health, IRCCS “Burlo Garofolo,” Trieste , Italy
13. Institute of Gastroenterology, Nutrition and Liver Diseases, Schneider Children’s Medical Centre, Petach-Tikva, Sackler Faculty of Medicine, Tel Aviv University , Tel Aviv , Israel
14. Pediatric Hepatology, Gastroenterology and Transplantation Department, ASST Papa Giovanni XXIII , Bergamo , Italy
15. Pediatric Department, Children’s Hospital Vittore Buzzi, University of Milan , Milan, Italy
16. Juliet Keidan Institute of Pediatric Gastroenterology, Hepatology, and Nutrition, Shaare Zedek Medical Center, the Hebrew University of Jerusalem, Jerusalem , Israel
17. Gastroenterology and Nutrition Unit, Hospital Infantil Universitario Niño Jesús , Madrid , Spain
18. Pediatric Gastroenterology and Hepatology Research Center, Children’s Medical Center, Tehran University of Medical Sciences , Tehran , Iran
19. Gastroenterology and Nutrition Unit, Meyer Children Hospital IRCCS , Florence , Italy
20. Department of Pediatrics, Gastroenterology and Nutrition Jagiellonian University Medical College , Kracow , Poland
21. Pediatric Gastroenterology and Liver Unit, University Children’s Hospital of the University Medical Centre Ljubljana , Ljubljana , Slovenia
22. Pediatric Gastroenterology Institute, Tel Aviv Sourasky Medical Center and the Faculty of Medicine, Tel Aviv University , Tel Aviv , Israel
23. Pediatric gastroenterology clinic, Meir Medical Center, Kfar Saba and School of Medicine, Tel-Aviv University , Tel Aviv , Israel