1. Dept. of Internal Medicine II, Klinikum Großhadern, University of Munich, Munich, Germany
2. Dept. of Gastroenterology, Hepatology & Infectious Diseases, University of Magdeburg, Magdeburg, Germany
3. Department of Haematology and Oncology, Rudolf Virchow Klinikum, Free University Berlin, Berlin, Germany
4. Dept. of Medicine, Elisabeth Hospital, Essen, Germany
5. Dept. of Pathology, Klinikum Bayreuth, Bayreuth, Germany