[1] Univ Saarland, Dept Radiotherapy, D-6650 Homburg, Germany
[2] Univ Munster, Dept Radiotherapy, D-4400 Munster, Germany
[3] Univ Munster, Dept Thorac Surg, D-4400 Munster, Germany
[4] Lungenklin Hemer, Dept Pneumol, Hemer, Germany
[5] Lungenklin Hemer, Dept Radiotherapy, Hemer, Germany
[6] Univ Munster, Dept Biomath, D-4400 Munster, Germany
[7] Univ Saarland, Dept Pneumol, D-6650 Homburg, Germany
[8] Univ Munster, Dept Med Oncol, D-4400 Munster, Germany