1. Department of Gastroenterology, Hepatology and Infectious Diseases, Medical Faculty; Heinrich Heine University; Düsseldorf Germany
2. Pediatric Gastroenterology and Hepatology, Department for Pediatric Kidney, Liver and Metabolic Diseases; Hannover Medical School; Hannover Germany
3. Pediatric Hepatology and Liver Transplantation, Transplantation Center; University Medical Center Hamburg-Eppendorf; Hamburg Germany
4. Pediatric Liver Center; King's College Hospital; London United Kingdom
5. Department of General Pediatrics; Heidelberg University Hospital; Heidelberg Germany
6. Pediatric Clinic; Lukaskrankenhaus GmbH; Neuss Germany
7. Clinic of General Pediatrics; University Hospital; Bonn Germany
8. Department for Pediatric Nephrology, Gastroenterology, Endocrinology and Transplant Medicine, Clinic for Pediatrics II, University Children's Hospital Essen; University Duisburg-Essen; Essen Germany
9. Children's Hospital; Albert Ludwigs University; Freiburg Germany
10. Institute of Liver Studies; King's College Hospital; London United Kingdom
11. Clinical Laboratory Services Division; Dhahran Health Center; Dhahran Saudi Arabia
12. Latvian Center of Pediatric Gastroenterology/Hepatology; University Children's Hospital; Riga Latvia
13. Texas Children's Hospital Liver Center, Baylor College of Medicine, Gastroenterology; Houston TX
14. Pediatric Surgery/Pediatric Liver and GI Transplant; Osaka University Graduate School of Medicine; Osaka Japan
15. Institute of Biochemistry; Heinrich Heine University; Düsseldorf Germany
16. Department of Otorhinolaryngology (ENT); Heinrich Heine University School of Medicine; Düsseldorf Germany
17. Medical Clinic I; Bethanien Hospital; Moers Germany