1. Division of Thoracic and Hyperbaric Surgery, Department of Surgery; Medical University Graz; Austria
2. Division of Oncology, Department of Internal Medicine; Medical University Graz; Austria
3. Clinical Institute of Medical and Chemical Laboratory Diagnostics; Medical University Graz; Austria
4. Department of Internal Medicine; Medical University Graz; Austria
5. Institute of Medical Informatics, Statistics and Documentation; Medical University Graz; Austria