1. Department of Gastroenterology, Hepatology and Infectious Diseases; University Hospital, Heinrich Heine University Düsseldorf; Düsseldorf Germany
2. Department of General Pathology; University of Heidelberg; Heidelberg Germany
3. Department of General Paediatrics; Centre for Paediatric and Adolescent Medicine; University of Heidelberg; Heidelberg Germany
4. Department of Paediatrics; Lukas Hospital; Neuss Germany