1. Department of Radiation Oncology, Antoine Lacassagne Cancer Centre, University of Côte d'Azur, Nice, France.
2. Department of Radiation Oncology, Catalan Institute of Oncology, Barcelona, Spain.
3. Department of Oncology, Semmelweis University, Budapest, Hungary.
4. Department of Radiation Oncology, Erlangen University Hospital, Erlangen, Germany.