1. Department of Dermatology, University Hospital St. Poelten, Karl Landsteiner University of Health Sciences, A-3100 St. Poelten, Austria
2. Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Medical University of Vienna, A-1090 Vienna, Austria
3. Institute of Pathophysiology and Allergy Research, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, A-1090 Vienna, Austria