1. Professor of Medical Oncology and Scientific Director of the Tumor Biology Center at the University of Freiburg, Breisacherstrasse 117, D–79106 Freiburg im Breisgau, Germany. E‐mail:
2. Consultant at the Department of Otorhinolaryngology, Technical University of Munich, Klinikum rechts der Isar, Ismaningerstr. 22, D–81675 Munich, Germany. E‐mail: