1. Medical University of Vienna, Department of Medicine I, Division of Infectious Diseases and Tropical Medicine, Vienna, Austria
2. Medical University of Vienna, Department of Angiology, Vienna, Austria
3. Evangelic Hospital Vienna, Department of Neurology, Vienna, Austria
4. Medical University of Vienna, Department of Laboratory Medicine, Division of Clinical Microbiology, Vienna, Austria
5. Ulm University Hospital, Institute of Medical Microbiology and Hygiene, Ulm, Germany
6. Medical University of Vienna, Department of Clinical Pharmacology, Vienna, Austria.