1 Department of Internal and Respiratory Medicine, Hospital Graz II, Academic Teaching Hospital of the Medical University of Graz, Graz, Austria. Electronic address: otmar.schindler@kages.at.
2 Department of Internal and Respiratory Medicine, Hospital Graz II, Academic Teaching Hospital of the Medical University of Graz, Graz, Austria.
3 Department of Internal Medicine, Division of Gastroenterology and Infectious Diseases, Hospital Graz II, Academic Teaching Hospital of the Medical University of Graz, Graz, Austria.
4 Institute of Hospital Hygiene and Microbiology, Styrian Hospital Corporation, Graz, Austria.
5 Institute for Radiodiagnostics, Hospital Graz II, Academic Teaching Hospital of the Medical University of Graz, Graz, Austria.