1. Division of Epidemiology and Health Services Research, Institute of Medical Biostatistics, Epidemiology, and Informatics; University Medical Centre of Johannes Gutenberg University; Mainz Germany
2. Head and Neck Unit, Department of Surgical Oncology; Instituto Português de Oncologia Francisco Gentil do Porto; Porto Portugal
3. Oncology Departments, Complejo Hospitalario de Navarra; Pamplona Spain
4. Department of Otolaryngology, Head and Neck Surgery; University of Heidelberg; Heidelberg Germany
5. Department of Otolaryngology Head and Neck Surgery; University of Leipzig; Leipzig Germany
6. Department of Oral Surgery and Oral Medicine, Faculty of Dentistry; University of Oslo; Oslo Norway
7. Department of Otolaryngology, Head and Neck Surgery; Instituto Português de Oncologia Francisco Gentil do Porto; Porto Portugal
8. Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University; Taiwan
9. Leeds Institute of Cancer and Pathology, University of Leeds; Leeds United Kingdom
10. Clinic of Otorhinolaryngology, Jena University Hospital; Jena Germany
11. Department of Otolaryngology and Head and Neck Surgery; Sahlgrenska University Hospital; Gothenburg Sweden
12. Quality Of Life Department, Instituto Oncológico Fundación Arturo López Pérez; Santiago Chile
13. Regional Centre for Excellence in Palliative Care, Department of Oncology; Oslo Universitetssykehus, Oslo, Norway and European Palliative Care Research Centre, Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology; Trondheim Norway
14. Department of Oncology; Aarhus University Hospital; Aarhus Denmark
15. Department of Medical Oncology and Hematology; Kobe University Hospital; Kobe Japan
16. Department of Medical Oncology; Fondaczione IRCCS Istituto Nazionale Tumori; Milano Italy
17. Clinic of Hospital Dentistry, Dental Oncology Unit; School of Dentistry, University of Athens; Athens Greece
18. Deapartment of Quality of Life; Istituto Nazionale per lo Studio e la Cura dei Tumori “Fondazione Giovanni Pascale” - IRCCS; Naples Italy
19. Radiation Oncology Department; Brasilia University Hospital; Brasilia Brazil
20. Department of Radiation Therapy; University Hospital Schleswig-Holstein; Kiel Germany
21. Behavioral Medicine Division, Winthrop P. Rockefeller Cancer Institute, University of Arkansas for Medical Sciences; Little Rock Arkansas
22. Department of Medical Didactics; Jagiellonian University Medical College; Krakow Poland
23. Department of Otolaryngology / Head and Neck Surgery; VU University Medical Center, Amsterdam, The Netherlands and Department of Clinical Psychology, VU University; Amsterdam The Netherlands
24. Department of Oral and Maxillofacial Surgery, Sheba Medical Center, Tel-Hashomer, Israel and Department of Oral Pathology and Oral Medicine; School of Dental Medicine, Tel Aviv University; Tel Aviv Israel
25. Department of Psychology; National Cancer Institute CRO-Aviano; Aviano Italy
26. Department of Medical Psychology; University of Leipzig; Leipzig Germany