1 Department of General Pediatrics and Neonatology, University Children's Hospital, Giessen.
2 Division of Pediatric Gastroenterology and Hepatology, Department of Pediatrics, Dr. von Hauner Children's Hospital, University Hospital, LMU Munich, Munich.
3 Department of Paediatrics, St. Marien Hospital, Bonn.
4 Childrens Hospital, Klinikum Links der Weser, Bremen.
5 Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm.
6 Christliches Kinderhospital, Osnabrück.
7 Division of Child and Adolescent Medicine, Deutsche Klinik für Diagnostik, Wiesbaden.
8 Department of Pediatric Gastroenterology, Children's Hospital St. Hedwig, University of Regensburg, Germany.
9 GPGE-Educational Center for Pediatric Gastroenterology, Department of Pediatrics, Medical University of Graz, Graz, Austria.