1. Department of Radiation Oncology, Ludwig-Maximilians-University Munich, Munich, Germany
2. Department of Radiation Oncology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
3. Department of Otorhinolaryngology, Head and Neck Surgery, and Walter Brendel Centre of Experimental Medicine, Ludwig-Maximilians-University Munich, Munich, Germany
4. Institute of Veterinary Pathology at the Center for Clinical Veterinary Medicine, Ludwig-Maximilians-University Munich, Munich, Germany
5. Department of Radiation Oncology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
6. Department of Organic Chemistry, NCCR Chemical Biology, University of Geneva, Geneva, Switzerland