1. Department of Thoracic and Vascular Surgery, Klinik Loewenstein, Löwenstein, Germany
2. Institute for Radiation Therapy, SLK-Kliniken Heilbronn, Heilbronn, Germany
3. Department of Oncology, Klinik Loewenstein, Löwenstein, Germany
4. Department of Thoracic Surgery, St. Vincentius Kliniken Karlsruhe, Karlsruhe, Germany