1. Laboratory of Experimental Radiotherapy Department of Oncology Leuven Belgium
2. Department of Radiation Oncology Leuven Cancer Institute, University Hospitals Leuven Leuven Belgium
3. Department of Radiation Oncology University of Michigan Ann Arbor Michigan USA
4. Division of Medicine, Department of Radiation Oncology St. Vincent's Hospital, The University of Melbourne Melbourne Victoria Australia
5. Department of Radiation Oncology, Institute of Oncology University of Ljubljana Ljubljana Slovenia
6. Department of Otorhinolaryngology – Head and Neck Surgery HUS Helsinki University Hospital, University of Helsinki Helsinki Finland
7. Department of Radiation Oncology University Medical Center Groningen Groningen the Netherlands
8. Department of Radiation Oncology College of Medicine, University of Florida Gainesville Florida USA
9. Department of Radiation Oncology The Prince of Wales Cancer Centre Sydney New South Wales Australia
10. Department of Head and Neck Surgical Oncology UMC Utrecht Cancer Centre, University Medical Centre Utrecht Utrecht the Netherlands
11. Department of Clinical Oncology University of Hong Kong Hong Kong China
12. Department of Otolaryngology University of Udine School of Medicine Udine Italy
13. International Head and Neck Scientific Group Udine Italy