1. Section of Infectious Diseases and Tropical Medicine; Department of Internal Medicine; Medical University of Graz; Graz; Austria
2. Division of Nephrology; Department of Internal Medicine; Medical University of Graz; Graz; Austria
3. Institute of Hygiene, Microbiology and Environmental Medicine; Medical University of Graz; Graz; Austria
4. Division of Hematology; Department of Internal Medicine; Medical University of Graz; Graz; Austria