1. Department of Medicine B, University Hospital Münster, Münster, Germany
2. Department of Biochemistry, University of Oxford, Oxford, United Kingdom of Great Britain and Northern Ireland
3. Department of Neurology and Research Center Neurosensory Sciences, University of Oldenburg, Oldenburg, Germany
4. Department of Medicine D, University Hospital Münster, Münster, Germany
5. Department of Pathology, University Hospital Münster, Münster, Germany
6. Institute of Human Genetics, University Hospital Münster, Münster, Germany
7. Department for Gastroenterology and Hepatology, University Hospital Essen, Essen, Germany
8. Department of Gastroenterology, Medical Center Osnabrück, Osnabrück, Germany