1. Section of Infectious Diseases, Department of InternalMedicine, Medical University of Graz, A-8010 Graz, Austria
2. Institute of Hygiene, Microbiology and EnvironmentalMedicine, Medical University of Graz, A-8010 Graz, Austria
3. Division of Thoracic Surgery, Medical Universityof Graz, A-8010 Graz, Austria