[1] Univ Rostock, Dept Radiat Oncol, D-18055 Rostock, Germany
[2] Univ Regensburg, Dept Radiotherapy, D-93053 Regensburg, Germany
[3] Otto Von Guericke Univ, Dept Radiotherapy, Magdeburg, Germany
[4] Univ Halle Wittenberg, Dept Radiotherapy, D-06108 Halle, Germany
[5] Univ Marburg, Dept Radiotherapy, Marburg, Germany
[6] Coordinat Ctr Clin Trials, Halle, Germany
[7] Dept Radiat Oncol Kiel, Kiel, Germany
[8] Dept Radiooncol, Lubeck, Germany