1. Department of Radiation Sciences - Research Unit Radiation Cytogenetics; Helmholtz Center Munich - German Research Center for Environmental Health (GmbH); Neuherberg 85764 Germany
2. Department of Radiotherapy and Radiooncology; Philipps-University Marburg; University Hospital Gießen and Marburg; Marburg 35043 Germany
3. Helmholtz Center Munich; Clinical Cooperation Group ‘Personalized Radiotherapy of Head and Neck Cancer’; Neuherberg 85764 Germany
4. Department of Radiotherapy and Radiation Oncology; Ludwig-Maximilians-Universitaet; University Hospital Munich; Munich 81377 Germany