1. Hannover Medical School, Division of Pediatric Gastroenterology and Hepatology, Department of Pediatric Kidney, Liver, and Metabolic DiseasesHannover Germany
2. Department of Medicine IISaarland University Medical CenterHomburg Germany
3. University Hospital, Heinrich Heine University Düsseldorf, Department of Gastroenterology, Hepatology and Infectious DiseasesDüsseldorf Germany
4. Division of Pediatric Gastroenterology, Clinic for Pediatrics IIUniversity Hospital, University EssenEssen Germany
5. Department of General PediatricsUniversity HospitalHeidelberg Germany
6. Department of PediatricsUniversity Medical Center of the Johannes Gutenberg University MainzMainz Germany
7. Klinikum KasselPediatric GastroenterologyKassel Germany
8. Klinik St. MarienstiftMagdeburg Germany
9. KUNO University Children's HospitalRegensburg Germany
10. LukaskrankenhausChildren's HospitalNeuss Germany
11. Institute of Immunology and ImmunotherapyUniversity of BirminghamBirmingham United Kingdom