[1] Univ Med Ctr Schleswig Holstein Campus Lubeck, Dept Radiotherapy, Ratzeburger Allee 160, D-23538 Lubeck, Germany
[2] Univ Hosp Schleswig Holstein Kiel, Dept Radiat Oncol, Arnold Heller Str 3, D-24105 Kiel, Germany
[3] Univ Freiburg, Fac Med, Med Ctr, Dept Radiat Oncol, Robert Koch Str 3, D-79106 Freiburg, Germany
[4] Univ Leipzig, Dept Radiat Oncol, Med Ctr, Stephanstr 9a, D-04103 Leipzig, Germany
[5] Charite Univ Med Berlin, Dept Radiat Oncol, Augustenburger Pl 1, D-13353 Berlin, Germany
[6] Univ Med Ctr Hamburg Eppendorf, Dept Radiotherapy & Radiat Oncol, Martinistr 52, D-20246 Hamburg, Germany
[7] Ludwig Maximilians Univ Munchen, Clin & Polyclin Radiotherapy & Radiooncol, LMU Clin, Marchioninistr 15, D-81377 Munich, Germany
[8] Univ Med Ctr Hamburg Eppendorf, Dept Stem Cell Transplantat, Martinistr 52, D-20251 Hamburg, Germany
[9] Univ Hosp Schleswig Holstein, Dept Hematol & Oncol, Ratzeburger Allee 160, D-23538 Lubeck, Germany
[10] Univ Med Ctr Hamburg Eppendorf, Dept Oncol Hematol & Bone Marrow Transplantat, Div Pneumol, Martinistrasse 52, Hamburg, Germany
[11] Univ Med Ctr Hamburg Eppendorf, Inst Med Biometry & Epidemiol, Martinistr 52, D-20246 Hamburg, Germany
[12] Univ Hosp Schleswig Holstein, Dept Otorhinolaryngol Head & Neck Surg, Ratzeburger Allee 160, D-23538 Lubeck, Germany