1. Department of Radiotherapy Guizhou Cancer Hospital & The Affiliated Cancer Hospital of Guizhou Medical University Guiyang China
2. Department of Otolaryngology‐Head and Neck Surgery The First People's Hospital of Yunnan Province Kunming China
3. Department of Radiotherapy Yunnan Cancer Hospital & The Third Affiliated Hospital of Kunming Medical University Kunming China
4. Department of Oncology Puer People's Hospital Puer China