1. Department of Pediatric Surgery, Hannover Medical School, Hannover, Germany
2. Department of Pediatric Surgery and Pediatric Urology, Goethe University Frankfurt /M., Germany
3. Department of Pediatric Gastroenterology, Christliches Kinderhospital Osnabrueck, Osnabrueck, Germany
4. Department of Paediatric Gastroenterology and Hepatology, University Hospital for Children and Adolescents, University of Tuebingen, Baden-Württemberg, Germany
5. Division of Pediatric Gastroenterology and Hepatology, Department of Pediatric Kidney, Liver and Metabolic Diseases, Hannover Medical School, Hannover, Germany
6. Liver Unit, Birmingham Women’s and Children’s Hospital, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham
7. Department of Pediatric Surgery, Municipal Hospital, Karlsruhe, Baden-Wuerttemberg, Germany