[1] Univ Med Ctr Mainz, Dept Radiat Oncol, Mainz, Germany
[2] German Canc Res Ctr, German Canc Consortium DKTK, Partner Site Mainz, Heidelberg, Germany
[3] Univ Med Ctr Mainz, Inst Med Biostat Epidemiol & Informat IMBEI, Mainz, Germany
[4] Univ Freiburg, Dept Radiat Oncol, Med Ctr, Freiburg, Germany
[5] German Canc Res Ctr, German Canc Consortium DKTK, Partner Site Freiburg, Heidelberg, Germany
[6] Univ Hosp Schleswig Holstein, Dept Radiat Oncol, Kiel, Germany
[7] Univ Leipzig, Dept Radiat Oncol, Med Ctr, Leipzig, Germany
[8] Univ Med Ctr Mainz, Dept Radiat Oncol, Mainz, Germany