1. Department of Radiation Oncology, Beijing Hospital, National Center of Gerontology; Institute of Geriatric Medicine Chinese Academy of Medical Sciences Beijing P. R. China
2. State Key Laboratory of Molecular Oncology and Department of Radiation Oncology, National Cancer Center/Cancer Hospital Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC) Beijing P. R. China
3. Department of Radiation Oncology Peking University Third Hospital Beijing P. R. China
4. Department of Radiation Oncology Peking University First Hospital Beijing P. R. China
5. Department of Radiation Oncology, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine Sun Yat‐sen University Cancer Center Guangzhou 510060 P. R. China
6. Department of Urology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine Chinese Academy of Medical Sciences Beijing P. R. China
7. Department of Nuclear Medicine Department, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine Chinese Academy of Medical Sciences Beijing P. R. China