¹La Paz Hospital, Radiation Oncology, Madrid, Spain

(1)The Catholic University of Korea, Radiation Oncology, Seoul, Korea Republic of;

¹Gustave Roussy, Head and Neck Oncology, Villejuif, France; ²Gustave Roussy, Anesthesia, Villejuif, France; ³The Royal Marsden, Head and Neck Unit, London, United Kingdom

¹National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Department of Radiation Oncology, Beijing, China

(1)Portuguese Oncology Institute of Coimbra, Medical Physics Department, Coimbra, Portugal;(2)INESC Coimbra, Inesc Coimbra, Coimbra, Portugal;(3)University of Aveiro, Physics Department, Aveiro, Portugal;(4)University of Coimbra, Faculty of Economy, Coimbra, Portugal;(5)University of Coimbra, Centre for Business and Economics Research, Coimbra, Portugal;(6)Institute Polytechnic of Porto, Health School Polytechnic of Porto, Porto, Portugal;(7)University of Aveiro, I3N Physics Department, Aveiro, Portugal;

(1)The Newcastle Upon Tyne Hospitals NHS Trust, Northern Centre for Cancer Care, Newcastle upon Tyne, United Kingdom;(2)Newcastle University, Northern Institute of Cancer Research, Newcastle upon Tyne, United Kingdom;(3)The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Northern Centre for Cancer Care, Newcastle upon Tyne, United Kingdom;