1. Department of Internal Medicine II, HSK Hospital, Teaching Hospital of the University Medicine of Mainz, Wiesbaden, Germany
2. Department of Internal Medicine, Diakonissen Stiftungskrankenhaus, Speyer, Germany
3. Department of Gastroenterology and Interventional Endoscopy, St. John of God Hospital, Regensburg, Germany
4. Institute of Pathology, Bayreuth Hospital, Bayreuth, Germany