1. Department of Biochemistry and Molecular Biology, Medical School RWTH Aachen, 52074 Aachen, Germany
2. Department of Paediatrics, Medical School RWTH Aachen, 52074 Aachen, Germany
3. Rudolf Virchow Center, DFG Research Center for Experimental Biomedicine, 97080 Würzburg, Germany
4. Department of Gastroenterology, Hepatology and Infectiology, Medical School Heinrich-Heine University, 40225 Düsseldorf, Germany
5. Department of Biochemistry, Medical School Hannover, 30625 Hannover, Germany