[1] Catholic Univ Louvain, St Luc Univ Hosp, Dept Radiat Oncol, Brussels, Belgium
[2] Velindre Canc Ctr, Dept Radiat Oncol, Cardiff, S Glam, Wales
[3] Stanford Univ, Sch Med, Dept Radiat Oncol, Stanford, CA 94305 USA
[4] CHU Vaudois, Lausanne, Switzerland
[5] Univ Lausanne, Dept Radiat Oncol, Lausanne, Switzerland
[6] Charite, Dept Radiooncol & Radiotherapy, Berlin, Germany
[7] Sun Yat Sen Univ, Dept Radiat Oncol, Canc Ctr, Guangzhou, Guangdong, Peoples R China
[8] Univ Michigan Hlth Syst, Dept Radiat Oncol, Ann Arbor, MI USA
[9] Sichuan Canc Hosp, Dept Radiat Oncol, Chengdu, Sichuan, Peoples R China
[10] Vall Hebron Univ Hosp, Radiat Oncol Serv, Barcelona, Spain
[11] Tata Mem Hosp, Dept Radiat Oncol, Bombay, Maharashtra, India
[12] Catholic Univ Louvain, St Luc Univ Hosp, Dept Head & Neck Surg, Brussels, Belgium
[13] Hosp Israelita Albert Einstein, Dept Radiat Oncol, Sao Paulo, Brazil
[14] Fudan Univ, Dept Radiat Oncol, Shanghai Canc Ctr, Shanghai, Peoples R China
[15] Univ Sheffield, Sch Clin Dent, Unit Oral & Maxillofacial Pathol, Sheffield, S Yorkshire, England
[16] Odense Univ Hosp, Dept Oncol, Odense, Denmark
[17] Radboud Univ Nijmegen, Dept Radiat Oncol, Med Ctr, Nijmegen, Netherlands
[18] Univ Hong Kong, Hong Kong, Hong Kong, Peoples R China
[19] Univ Hong Kong, Shenzhen Hosp, Dept Clin Oncol, Hong Kong, Hong Kong, Peoples R China
[20] Hop Univ Pitie Salpetriere Charles Foix, Dept Radiat Oncol, Paris, France
[21] Univ Helsinki, Helsinki, Finland
[22] Helsinki Univ Hosp, Dept Otorhinolaryngol Head & Neck Surg, Helsinki, Finland
[23] Univ Cattolica Sacro Cuore, Fdn Policlin Univ Agostino Gemelli, Polo Sci Oncol Ematol, Rome, Italy
[24] Univ Brescia, Div Otorhinolaryngol Head & Neck Surg, Brescia, Italy
[25] Univ Toronto, Princess Margaret Hosp, Dept Radiat Oncol, Toronto, ON, Canada
[26] Med Sur, Unit Radiotherapy, Mexico City, DF, Mexico
[27] Princess Alexander Hosp, Dept Radiat Oncol, Brisbane, Qld, Australia
[28] Maria Sklodowska Curie Canc Ctr, Inst Oncol, Gliwice, Poland
[29] Asklepios St Georg Hosp, Hermann Holthusen Inst Radiotherapy, Hamburg, Germany
[30] Natl Canc Ctr Singapore, Div Radiat Oncol, Singapore, Singapore
[31] Case Western Reserve Univ Hosp, Dept Radiat Oncol, Cleveland, OH 44106 USA
[32] Univ Calif San Francisco, Dept Radiat Oncol, San Francisco, CA USA
[33] Univ Hosp Basel, Clin Radiotherapy & Radiat Oncol, Basel, Switzerland
[34] Aarhus Univ Hosp, Dept Oncol, Aarhus, Denmark